Are we all convinced it is London ??
The first letter looks more like the B in boarder,
bearing in mind that the line above has 'overflowed' into the next line,
which means that the enumerator was a bit cramped.
Also, judging by the o a and r in boarder, the first word could be ending ..rden
which could give you Marden or (less likely) Ruardean in Hereford
(neither of which begin with B, but that's life

)
Bob