There is no published literature on this particular case of lexical variation.
Once again there isn’t much variation outside the North, with a predominance of alley/alleyway. Within the Midlands and the North, the other variants form a few clear patterns, such as ginnel around Greater Manchester and Leeds, entry around Merseyside, and gennel around Sheffield. Just south of Sheffield, there are a cluster of jitty-users around Derby and Chesterfield. Interestingly, there are other sharp regional divides present in the North too: notice the pocket of snicket responses around Bradford despite its close proximity to ginnel-favouring Leeds.