Potential problems soon.
Stamford Hill and Walthamstow have similar Fajr starting times such as 2:45ish whereas just few mins away Clapton and Noorul Islam in Leyton have there's about 1:15ish. Which means in a year or 2 (when Ramadhan comes in to July/August) one person on one road (i.e. Reighton Road where some go to Stamfod Hill and some to Clapton) who normally goes Stamford Hill will still be eating his Sehri and his next door neighbour on the same road but who goes Clapton would have started his fast already as his time for Sehri would have past????
Not to mentioned Tarawi Salaat that would finish around 12:15ish (as Esha jamaat would be around 10:45ish) in both Clapton and Stamford Hill but the Clapton musallee's would then more or less straight after Tarawi have their sehri and pray fajr jamat around 1:30ish where the Stamford Hill Musalle's would have to wait a couple hours or so for sehri end time around 2:45ish then pray fajr at 3ish??