Sleep consultant - any recommendations

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As it says on the tin - does anyone have any recommendations? We are in London but that probably doesn't make much difference as I think they usually conduct business via phone/skype.

TIA.

Following as I am considering speaking to one as well for my 5 month olds sleep issues

I used Nicola Watson from Child Sleep Solutions when DS was 9 months old and she was fantastic!!!

I've used Rachel Waddilove's consultantancy service for DS (also followed advice in her 'How to enjoy year one' and 'Sleep solutions' and found her wise, kind and very effective!