Islington-Hackney-Haringey-Enfield for 9 seats seems like a fairly natural grouping to me. Islington can stand alone, but only if you completely reshuffle the two seats, which seems daft when Islington S just needs one ward to get in quota. Haringey and Enfield work for 5 small seats, but if you do that then Hackney almost certainly ends up in a pitchfork bait grouping involving West London. So unless there are problems in Barnet that pairing with Brent and a judicious ward split won't solve, I'm working on the presumption that this is a natural sub-unit. Here are six ways of doing it:
Option 1Islington N (73970) - unchanged
Islington S & Finsbury (75905) - gains De Beauvoir from Hackney S
Hackney S & Shoreditch (75117) - loses De Beauvoir to Islington S and King's Park to Hackney N, gains Dalston from Hackney N
Hackney N & Stoke Newington (75401) - loses Dalston to Hackney S and Brownswood and Woodberry Down to Tottenham S, gains King's Park from Hackney N
Tottenham S & Woodberry Down (71991) - loses Tottenham Hale, Northumberland Park and White Hart Lane to Edmonton, gains Noel Park from Hornsey and Brownswood and Woodberry Down from Hackney N. Tottenham S & Manor House might be an alternative name?
Hornsey & Wood Green (76067) - loses Noel Park to Tottenham S
Enfield Southgate (75002) - gains Bush Hill Park from Edmonton
Edmonton & Tottenham N (72606) - loses Ponders End to Enfield N and Bush Hill Park to Southgate, gains Tottenham Hale, Northumberland Park and White Hart Lane from Tottenham
Enfield N (76824) - gains Ponders End from Edmonton
After re-alignment to new ward boundaries, 84898 electors are moved. This is the least-change option and I think it's probably the neatest on a map. On the downside, Wood Green is split. From a partisan basis, not terrible for Labour, even though Edmonton & Tottenham N is a pack. Ponders End shores up Enfield N a little (not that it particularly needs it) and whilst Bush Hill Park is comfortably the most Conservative bit of Edmonton, it wouldn't cut into Charambolous' majority that much.
This would definitely be my preference out of the options I've presented.
Option 2Islington N (73970) - unchanged
Islington S & Finsbury (75905) - gains De Beauvoir from Hackney S
Hackney S & Shoreditch (75117) - loses De Beauvoir to Islington S and King's Park to Hackney N, gains Dalston from Hackney N
Hackney N & Stoke Newington (75401) - loses Dalston to Hackney S and Brownswood and Woodberry Down to Tottenham S, gains King's Park from Hackney N
Tottenham S & Woodberry Down (71991) - loses Tottenham Hale, Northumberland Park and White Hart Lane to Edmonton, gains Stroud Green from Hornsey and Brownswood and Woodberry Down from Hackney N. Tottenham S & Manor House might be an alternative name?
Hornsey & Wood Green (76067) - loses Stroud Green to Tottenham S
Enfield Southgate (75002) - gains Bush Hill Park from Edmonton
Edmonton & Tottenham N (72606) - loses Ponders End to Enfield N and Bush Hill Park to Southgate, gains Tottenham Hale, Northumberland Park and White Hart Lane from Tottenham
Enfield N (76824) - gains Ponders End from Edmonton
The same as option 1, except the three Wood Green wards are kept together. 85788 electors are moved. My personal feeling is that Noel Park doesn't really distinct from Tottenham and that a boundary along Lordship Lane is no worse than one along Turnpike Lane, whereas the ECML is a clear boundary. YMMV
Option 3Islington N (73970) - unchanged
Islington S & Finsbury (75905) - gains De Beauvoir from Hackney S
Hackney S & Shoreditch (75117) - loses De Beauvoir to Islington S and King's Park to Hackney N, gains Dalston from Hackney N
Hackney N & Stoke Newington (75401) - loses Dalston to Hackney S and Brownswood and Woodberry Down to Tottenham, gains King's Park from Hackney N
Tottenham & Woodberry Down (74064) - loses Harringay to Hornsey and White Hart Lane to Southgate, gains Brownswood and Woodberry Down from Hackney N.
Hornsey (76100) - loses Woodside and Bounds Green to Southgate, gains Harringay from Tottenham
Southgate & Wood Green (76883) - loses Cockfosters and Oakwood to Enfield N, gains Woodside and Bounds Green from Hornsey and White Hart Lane from Tottenham
Edmonton (71669) - gains Brimsdown from Enfield N
Enfield N (73714) - loses Brimsdown to Edmonton, gains Cockfosters and Oakwood from Southgate
This option crosses the Enfield-Harringay boundary in the west rather than the east. There's probably an equally good case for either option, as the most notable boundary on the ground is the North Circular which is north of the borough boundary either way, but I only have personal experience of the eastern option so I'd welcome other opinions. 97325 electors are moved, so it's more disruptive. Wood Green is split which isn't great, but putting Harringay in with Hornsey is fine as it is by some distance the 'least Tottenham' Tottenham ward. From a partisan perspective Southgate becomes a safe seat but Enfield N becomes a marginal again.
Option 4Islington N (73970) - unchanged
Islington S & Finsbury (75905) - gains De Beauvoir from Hackney S
Hackney S & Shoreditch (75117) - loses De Beauvoir to Islington S and King's Park to Hackney N, gains Dalston from Hackney N
Hackney N & Stoke Newington (75401) - loses Dalston to Hackney S and Brownswood and Woodberry Down to Tottenham, gains King's Park from Hackney N
Tottenham & Woodberry Down (74505) - loses Harringay and West Green to Hornsey, gains Brownswood and Woodberry Down from Hackney N.
Hornsey (75921) - loses Woodside, Bounds Green and Noel Park to Southgate, gains Harringay and West Green from Tottenham
Southgate & Wood Green (76621) - loses Cockfosters and Oakwood to Enfield N, gains Woodside, Bounds Green and Noel Park from Hornsey
Edmonton (71669) - gains Brimsdown from Enfield N
Enfield N (73714) - loses Brimsdown to Edmonton, gains Cockfosters and Oakwood from Southgate
Much the same as option 3, except that Wood Green is kept together in exchange for Hornsey taking a Tottenham ward that really doesn't fit. I very much do not like this, but it is an option. 96884 electors are moved.
Option 5Islington N (73970) - unchanged
Islington S & Finsbury (75905) - gains De Beauvoir from Hackney S
Hackney S & Shoreditch (75117) - loses De Beauvoir to Islington S and King's Park to Hackney N, gains Dalston from Hackney N
Hackney N & Stoke Newington (75401) - loses Dalston to Hackney S and Brownswood and Woodberry Down to Tottenham, gains King's Park from Hackney N
Tottenham & Woodberry Down (74064) - loses Harringay to Hornsey and White Hart Lane to Southgate, gains Brownswood and Woodberry Down from Hackney N.
Hornsey (76100) - loses Woodside and Bounds Green to Southgate, gains Harringay from Tottenham
Southgate & Wood Green (76883) - loses Cockfosters and Grange Park to Enfield N, gains Woodside and Bounds Green from Hornsey and White Hart Lane from Tottenham
Edmonton & Enfield E (73409) - gains Brimsdown and Enfield Lock from Enfield N, loses Bush Hill Park to Enfield W
Enfield W (72347) - loses Brimsdown and Enfield Lock to Edmonton, gains Cockfosters and Grange Park from Southgate and Bush Hill Park from Edmonton
Similar to option 3, but the Enfield seats are realigned somewhat, with Edmonton taking Enfield Lock and Enfield W taking Grange Park and Bush Hill Park. 109127 electors are moved. Unifies the centre of Enfield, but I'm not entirely sure I like this orientation from an aesthetic viewpoint. And from a partisan viewpoint this is not very far off the most Tory seat you could draw in Enfield.
Option 6Islington N (73970) - unchanged
Islington S & Finsbury (75905) - gains De Beauvoir from Hackney S
Hackney S & Shoreditch (75117) - loses De Beauvoir to Islington S and King's Park to Hackney N, gains Dalston from Hackney N
Hackney N & Stoke Newington (75401) - loses Dalston to Hackney S and Brownswood and Woodberry Down to Tottenham, gains King's Park from Hackney N
Tottenham & Woodberry Down (74505) - loses Harringay and West Green to Hornsey, gains Brownswood and Woodberry Down from Hackney N.
Hornsey (75921) - loses Woodside, Bounds Green and Noel Park to Southgate, gains Harringay and West Green from Tottenham
Southgate & Wood Green (76248) - loses Cockfosters and Grange Park to Enfield N, gains Woodside, Bounds Green and Noel Park from Hornsey
Edmonton & Enfield E (73409) - gains Brimsdown and Enfield Lock from Enfield N, loses Bush Hill Park to Enfield W
Enfield W (72347) - loses Brimsdown and Enfield Lock to Edmonton, gains Cockfosters and Grange Park from Southgate and Bush Hill Park from Edmonton
Combines option 4 and option 5. Moves 116723 electors and hence is the most disruptive plan.