Actually, Captain 69 has very good coverage of London escorts and so-so depth on the rest of the UK and Europe.  If you're looking for information mainly in London, I'd recommend it.  Otherwise, it might be a little sparse.

When it comes to UK reviews, I usually stick to Punternet (www.punternet.com) for massage palours, and Captain69 for escorts (www.captian69.co.uk).  Cpt69 is a pay site, but if you are planning to hobby in London it's worth it.

Try punternet.com for UK reviews

The Capt69 reviews for pay do have extensive detail.
Coverage of the UK escorts is quite good.
It has been a very good value for me in Euro travels.

For the rest of Europe it is surprising how many escorts and reviews one can find on Capt69.

Paris, Amsterdam, Germany, Hungary, Spain, Italy, St Pete, Moscow, Romania, and Prague all have numerous reviews.

The Capt69 website is not as skillfully organized as TER-USA.
Most of the world outside of the UK is simply "OTHER."

I wrote the Captain with some suggestions, but he was offended at being questioned. LOL

Come to think of it I developed a detailed plan for TER international coverage also, posted it on "Suggestions," but it never saw the light of day. It seems odd to have all  major world cities and Nations under "OTHER."