Are those genuine back to back houses?
I only ask as there is often confusion since genuine back to backs are very rare to have survived as I understand it - by 'genuine I mean where the two houses share a party wall at the rear - ie no back door, and no windows at the back of the house. So a terrace of back to backs have only one exterior wall, the front wall, as the other three walls (apart from the houses at the ends of the rows of course) are all party wall. Most demolished because the lack of windows and doors on the back elevation considered insanitary in terms of space and fresh air requirements for occupiers.
Not possible to see from that picture if that is the case design wise in the Hebden Bridge example, but if course it may well be.
I have often heard people describe adjacent rows of terraces as 'back to back houses' but I believe that is not the same thing and is an incorrect description.
They probably were geniune back to back, but whether they still are is unlikely.
In the mid 1970's after finishing University I moved to Cornholme (nr Todmorden) and purchased a back to back end terraced house for £100. My brother had purchased a similar property around the front for £75
a couple of years earlier. The reason they were so cheap was because they were due to be demolished within two years, however they are still there and have been 'knocked through' to create a decent sized property - currently I think it is a holiday home.
My house had three floors - a room on each - and an outside loo. My brother's house had a cellar in which he installed a toilet and shower - when he moved away I bought his house and the couple who owned the house mine backed on to purchased mine.
I thoroughly enjoyed living there, many houses in Cornholme at the time were back to back, it was the poor relation to Todmorden which itself was definitely not as 'upmarket' as Hebden Bridge (even in the 1970's)
Incidentally, after four years I moved to Cambridge, living in an NHS rented house (luxury!), explaining to a female colleague that I used to live in a back to back, she said 'What do you mean? Back to back gardens?' - she
had no idea of the concept. Still makes me smile!