Hi
I was going through them myself year by year. Ancestry haven't indexed every year, they should have done 1955 though?
Anyway, if you find them in 1950, and then when you get the image, click on 1950 on the screen you get a drop down list of years.
Or, alternatively, use "browse this collection", select Reading and scroll down to 1955 (Wards in Reading constituency)
They are on image 240 of 244
And for 1956, that address is found on image 239 of 242.
So, sometime around 1955 we have lost them. I think the eldest daughter - if she married a Smith - may later be in Windsor.
John