Recommendations for supply agency for secondary teaching in London?

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Asking on behalf of a friend who has been teaching but not in a schools context, and is now looking at getting some supply work in London. History specialist, if that makes any difference.

Are there agencies to recommend or to avoid? Anything else she should be aware of?

Thanks!

Please, anybody? [hopeful emoticon]

The London Teaching Pool (TLTP) is really good. I also registered with Smart teachers and Academics -possibly a couple of others that I can't remember -they do still co tact me but never had to use them thanks to TLTP.

Thanks!
Good to have a recommendation.

Any other suggestion?

Looking at A+, Timeplan and Teachweb atm. Any feedback on those, or other ideas?