There is a delicious irony though: let us do the same for Wilson in Huyton...
1950 1.9
1951 2.6
1955 5.4
1959 9.8
1964 29.2
1966 33.8
1970 29.1
Electorate of 52k in 1950 and 107k (!) in 1970.
Of course, they kept building Allestree and Mickleover in Belper (surely he would have been saved by the 1968 boundary review, but I daresay most of Labour was relieved he'd gone) whereas they kept building Kirkby in yer darlin' 'Arold's seat. It's very easy in 2015 to mistakenly assume 'personal votes' in an era of mass national plebiscites coupled with enormous demographic change.
Very nice work on the maps, indeed excellent work, by the way - much better than the existing standard map. For the benefit of the boys and girls (and perhaps you, in doing 1950?) I've used your map to show the seats that (green) were unchanged from 1950, (yellow) had 'minor alterations' from 1950, and (orange) were new or significantly altered seats. *
As for 1950, I've got the English Commission's report and maps here. I have offered them to Vision of Britain; but if you wanted a lend, or for me to scan them into them, let me know.
* NB. That is, according to the reports of the Commissions. One particular error is pointed out
here.