Mistakes happen...Warwick & Leamington 1950. Declared result in Times Guide with correct (amended) result and explanation on page 320.
Thanks for pointing this out, I was previously unaware of this anomaly. Craig makes no mention of the error via one of his legendary footnotes, but does record the correct, amended figures, so these must have entered the political record as 'the' result in Warwick and Leamington 1950.
Presumably Plymouth's returning officer is hoping the same will happen for the correct figures for Sutton & Devonport, although currently hedges his bets by publishing both results side by side.