... That leaves us with the rest of Gtr Manchester plus Cheshire E = 1865973 = 24.96 = 25 seats.
So the question is whether this can be done in a way that
- has all seats within quota
- avoids ward splits
- avoids any seats covering three Gtr Manchester boroughs
- has fewer than three seats crossing the boundary between Gtr Manchester and Cheshire E
- avoids monstrosities and absurdities.
I am pleased to report that the answer is yes.
So ... (drumroll please) here is the plan.
WIGAN - Unchanged. 72733
MAKERFIELD - Unchanged. 71857
LEIGH - Gains Atherton and loses Astley Mosley Common. 74381
BOLTON WEST - Loses Atherton (and is thus entirely within Bolton); gains Hulton and Rumworth. 77948
BOLTON EAST - Compared with Bolton NE, gains Gt Lever. 72603
BURY - Compared with Bury N, gains Radcliffe N. 72771
RADCLIFFE AND FARNWORTH - Compared with Bolton SE (to which it is best regarded as the successor seat, although much altered): loses Gt Lever, Hulton and Rumworth; gains Radcliffe E, Radcliffe W, Pilkington Park, Besses, Unsworth. My initial thought was to put Radcliffe N in this seat and Unsworth in Bury. The numbers work; but looking in more detail, Radcliffe N is well away from the central area of Radcliffe whereas Unsworth penetrates almost to the centre of the town of Whitefield, so I feel it is less disruptive to put Radcliffe N in Bury. This seat and the following one mean between them that Bury S effectively vanishes. 76369
MANCHESTER BLACKLEY AND PRESTWICH - Compared with Blackley and Broughton: within Manchester, it loses Cheetham and gains Moston; outside Manchester, it loses the two Salford wards and gains the three remaining wards of Bury (i.e. the town of Prestwich). I feel that a seat with such a strong Manchester component should reflect this in its name. 77107
MANCHESTER CENTRAL - Gains Cheetham, loses Moston and Moss Side. 77434
MANCHESTER GORTON - Loses Whalley Range and Fallowfield; gains Withington and Burnage. This gives it a strong presence on the east side of the city proper and is surely an improvement on the current 'layer cake' arrangement in this part of Manchester. 73688
MANCHESTER MOSS SIDE - This could conceivably be regarded as the successor to the Withington seat but it is so much altered that it is probably easier to list the wards: Chorlton, Chorlton Park, Fallowfield, Moss Side, Old Moat, Whalley Range and the Trafford ward of Clifford. I regret the inclusion of a Trafford ward but if it must be done, Clifford is definitely the one to take; it is at the extreme northeastern tip of the borough and this is definitely an improvement on reinforcing a Manchester seat with half of Sale as under the present arrangements. The loss of Withington ward requires a name change but 'Moss Side' has history as a constituency name. 73952
MANCHESTER WYTHENSHAWE - The remaining seven wards of Manchester: in other words, everything south of the Mersey plus the two Didsbury wards. 74315
SALFORD - Gains Broughton and Kersal; loses the two Swinton wards. 73935
SWINTON AND WORSLEY - Gains the two Swinton wards plus AMC from Wigan borough; loses Barton, Irlam and Cadishead. I feel Swinton is too large a component of this seat not to be reflected in the name. 74495
STRETFORD AND IRLAM - This is Stretford & Urmston less Clifford and Bucklow St Martins but plus the three Salford wards of Barton, Irlam and Cadishead. Basically, the price you pay for losing the three-borough seat is a seat that crosses the Ship Canal but (as David Cameron would say) it is not the Amazon, and I'd point out there are two road bridges and a rail crossing within the seat. 77141
ALTRINCHAM AND SALE - Compared with Altrincham & Sale W, gains the other two Sale wards and Bucklow St Martins; loses Bowdon and the two Hale wards. 77226
ASHTON UNDER LYNE - Loses the two Failsworth wards (and is thus now wholly in Tameside); gains Audenshaw, Dukinfield and Mossley. 77564
STALYBRIDGE AND HYDE - Loses Mossley and gains Bredbury to come in just above the minimum. It's necessary to take a Stockport ward to avoid dividing the town of Denton. 71050
STOCKPORT AND DENTON - In effect the successor to Denton & Reddish, compared with which it loses Audenshaw and Dukinfield and gains Heatons N, Heatons S and Brinnington & Central. This means it now contains Stockport town centre, hence the name change, but effectively Stockport is the seat to disappear. 76088
HAZEL GROVE - Loses Bredbury; gains Manor and the infamous (and unsplit) Stepping Hill, plus Disley from Cheshire E. 73465
CHEADLE - Loses Stepping Hill and Heald Green; gains Edgeley and Davenport. 71478
KNUTSFORD AND WILMSLOW - Compared with Tatton, it loses all the parts in CW&C and gains three wards of Trafford (Bowdon and the Hale Wards) and one in Stockport (Heald Green). I agree it's not pretty to take wards from two different Gtr Manchester boroughs, but I can't find a better arrangement and it means that this seat and Hazel Grove are the only two to cross the boundary between Cheshire E and Gtr Manchester. Since 'Tatton' is an obscure name and there is no longer an eponymous local authority underpinning it, I've gone for a name that helps tell people where it is. 77784.
MACCLESFIELD - Loses Disley, gains Dane Valley. The latter is basically the Holmes Chapel area and it is an awkward spur on the Macclesfield seat, but it's needed for the numbers. 73513
CONGLETON - Loses Dane Valley, gains Haslington and Wyburnbury. The latter seems to me a better fit than Bunbury, as some others have proposed (although we need a minor tweak to fit new ward boundaries north of Crewe). 74186
CREWE AND NANTWICH - The rest of Cheshire E. 72890
In conclusion, I'd like to acknowledge my debt to Andrew Teale's plan.