Bro,
Like you I don't speak a word of mandarin/cantonese and I had a ball there, the girls are only after your money anyway so when you ring the bell they will figure out that what you want is sex !!
You are about 10 mins walk (if that) from the pussy epicentre in TST, so I suggest you build a quick spreadhseet with near targets and walk the walk, you will have a lot of fun.
As suggested, surf the forum for endorsements but with your pound sterling buying power nothing will be a bad experience !!
If time permits suggest 2:00 to 4:00 pm timeslot sessions, thereafter the mongers come out to fuck and it is tight in those hallways, so if you are shy etc go during low peak times.
Enjoy HK !! (I will be back in just under two weeks !!)