I recently moved back here permanently after being in London for a few decades longer than I would like to admit. A possibly lengthy but hopefully detailed enough response to ensure your trip is nothing short of memorable encounters that will live very long in your memory. (I was here for 5 months in 2023 and managed to see about 14 SP's, most several times but did not post any reviews so feel I most contribute to PERB somehow!)
Adultwork is your friend and the only resource you need, Make sure you select the UK option when you are researching from Canada prior to planning your endeavours which will make sense once you are on the site. You will see that it has the best method of both genuine and importantly 100% verified two sentence feedback comments from both punter and WG as well as full blown 'field reports' that validate the girl, service and so on, beyond reasonable doubt, normally providing more relevant and helpful detail then you would get in a week of reviews on PERB

(Sorry Perbians/Perbites) Use the advanced search functions which are very detailed and will match very specific services/menus and you will be destined to have some of the best experiences of your life! YMMV is not really a thing for WG's on AW
Some additional advice to ensure you do not get seduced down an ever increasing rabbit hole of various options and temptations your research will undoubtedly uncover . Agencies are mostly just a simple website front (taking a 25 to 40% cut) for WG's and do not have much concern about the quality of your visit such as the highly reputable Asian Fever or Coco Collective consistently strive to uphold here. (WG is the UK version of SP as in '
Working
Girl') The majority of their girls have 'Eastern European' instead of country specific on their individual profiles. This is code for Romanian. At the danger of being deemed discriminatory which I would normally abhor to knowingly engage, Romanian's unfortunately have a rather dire and dreadful reputation of adding on multiple extras as soon as the door closes behind you, a very lacklustre service and look to get you in, done and out before you can sing the second verse of God Save The King . I speak from personal experience when I thought I knew better than those who warned against those from Romania many, many times in various punting related forums. Unfortunately, the same is becoming more the norm for numerous Brazilian ladies who have opened up shop after moving en mass to Blighty in the last 2 years.. So unless you have an overwhelming desire to fulfil a rather oddly specific Romanian/Brazilian threesum fantasy, please do heed my advice regarding these particular countries of origin, as much as it pains me to perpetuate the stereotypes that some may see as both unfair and tainted with very white misogynist entitlement.
There are some absolute WG legends in London that you may be privy to stumble across on AW as it is known. I would be happy to give some personal top recommendations for ladies in their late 20s and beyond who have shaken my very soul to its core if that demographic happens to float your boat. You may also be a bit pleasantly that the cost will likely be 25% cheaper than here in Vancouver. I have not yet found an overwhelming example to validate the correlation between a higher tribute/donation being a reliably indicator of better service.
So if you have read this far in this long reply, Happy hunting and your welcome!!!