Whereabouts in the borough are you? I use Cinderella's agency in Barnes, and they have always sent really good cleaners over to help out. Not too expensive either, for round here! http://www.cinderellas.biz
I'm at other end of borough and am trying to fins cheap as poss cleaner cos only have tiny house, tight family budget but a health isse which makes houswork difficult. But thanks anyway, I'm sure a useful tip for others.