Mick dont get excited to quickly ,
you will most likely find they will want a time and date that suites them the first clean will normally be very smooth and you may get to clean all 7 in the same day but all the maintenance cleans could be problematic ,
they will mostly likely all need phone calls
they will most likely say not this time,or can you come at such and such time,
you may end up going to central london to clean 2 one day 2 the other , 1 the other hence reducing your hourly rate,
havnt got any customers in that particular post code but i do in other similar locations order values are less and still most were hard to manage had to let a load go! i much prefer a £15 all rounder then a £60 call for time and date, 7.15am dont be late then get a phone call at 6.50am when you are a mile away sorry can you leave it this time we have guests that arrived late last night customer

lol
picking the work up in these areas is no problem but managing them and keeping them could be a pain but thats why they are easy to pick up! but keep your figers crossed thou and good luck.! let us know how the 2nd cleans get on those will be the most important if you keep over 50% by the 4th clean considering the order value i would say thats a very good result.