From my experience - the following will likely be able to provide you with your desired service with skill, although as always better to confirm ahead (keep in mind its been a long time since my last visit to London):
*Veronica69_a
https://www.adultwork.com/4069138 - a real hardcore ride, definitely on the PSE side of the service scale
*Azra Turkish Delight
https://www.adultwork.com/4780023 - curvy atractive Turkish girl. Really enjoyed my meetings with her. Definitely a GFE service although she allowed CIM and swallowed without me asking. Relatively expensive compared to the rest on this list.
*Sexyyy_laura
https://www.adultwork.com/4044377 - great petite provider, highly skilled, very friendly and lists CIM as a basic service
*Anna (Thai)
http://www.olina-oriental-escort.com/escort-girl.php?girlid=423 - superb provider, from the intense shared shower to her departing DFK. Highly recommended.
There are of course many others providing these services but the list above should be a good starting point.