Yes 100% Howard. The house is by the steps that go up to St Leonard's Church at which point, where it narrows,the road joins Dental Street.
The passageway starts in the High Street, crosses Bartholomew Street and continues up towards the church. No I wasn't a choirboy but I worked in that area for a little while in the distant past.
(Edit)
PS. Forgot to mention, but that was when the old Bailey Bridge was still used to cross the Royal Military Canal which was later replaced by the nice new Town Bridge Howard!