Since nobody who actually knows anything seems to be around at the moment, I'll answer this for you. The alleyway behind the car park has no name at all at the moment. In 1904, the name of the street that formerly existed there was changed from Dorset to Duval. People on these boards often use either name, as the mood strikes them. You can read more of the street's history here.
Many thanks Grave Maurice, is appreciated. I'm still fairly new to this site so should spend more time looking at the other sections before firing off questions to all and sundry.
Monty, I had always thought that too, but it appears not to be the case. If you look at the old photos of Church Passage you'll see that same 'line' between the flagstones almost a foot from the northern side.
Observer - dare I point out that your Chamber Street photo doesn't show Swallow Gardens? It was a little off the right-hand edge.
__________________ Tour guides do it loudly in front of a crowd.
I found an article a while ago written by an elderly gent who'd emigrated to Canada in the thirties and who's grandparents ownded the bakery at 56 Artillery Lane several decades ago when he was a kiddy.
I can't remember if I found it through google or you lot, but I bookmarked it, so here it is (again, maybe).