I think it more likely that CJF was simply looking for a name for his design from a location in the City, much like the Finsbury Square layout mentioned on another Minories thread. Minories is an interesting sort of name that wouldn't necessarily be recognised as a street name by a fair proportion of people, I suspect. Minories the street isn't that far from Liverpool Street (let's face it, nowhere is that far from anywhere within The Square Mile - 1.4 miles maximum if Pythagoras is to be believed!) and is also the name of a former civil parish covering that area of the City. (Plus, although it does trip a fair few people up, it's easier to get the pronunciation right than St Mary Axe!)
If you look at the diagrams linked by Clive Mortimore, it's pretty obvious that Minories really is Liverpool Street re-imagined as a terminus, with the single slip replaced by two points. In other words, pretty much exactly what you'd expect from CJF's description of how he came up with it, as he recounted in the September 1981 issue of Model Railways (see this posting for an edited transcript). Aldgate is quite a bit bigger than Liverpool Street, although it does seem to have a loco spur which might be one feature which CJF borrowed for Minories. Fenchurch Street has a relatively long throat - almost 50% longer than the station platforms due to having a ladder of crossovers on the approach, whereas Minories can fairly easily be built with the platforms longer than the throat. Fenchurch Street is again noticeably larger than Minories which, combined with the more relaxed space constraints, IMO doesn't make it an obvious inspiration for a design which was deliberately intended to be compact.
All that said, I'm sure that CJF had lots of ideas gleaned from different prototype locations that he'd visited filed away in his head, so there could be any number of locations that could lay claim to inspiring certain details of the Minories design.