Reputable London flat sublet sites?

[eek]

I'm looking for a week-10 day sublet in London. Late April-early May.
Anyone happen to know of reputable listings services?
There are so danged many such business listed online : how to choose?!

Craig's List has sublets but I'd almost rather go through something that vets the lets (so to speak).

Or perhaps house-sitter needed?

I always stayed with my friends but one passed and the other went to the Sticks.

Thanks kindly!

eek

[T_i_B]

1. I hope you have plenty of dosh

as property prices in London are quite frankly extortionate! Rental prices are pretty steep to boot!