Wasn't quite sure what you were looking for as urban dictionary defines waif as a poor, skinny, homeless child typically in Dickensian London. Normally has unnecessary filth about his face and/or clothing.
I'm guessing that's not what you are looking for, so, I tried for attractive and thin.
I did a review of Nikkii which you can find here (https://www.ukpunting.com/index.php?topic=10437.0
). Her profile is here (https://www.adultwork.com/1883427
). She does 30 mins for £60.
I did a review of Enishe which you can find here(https://www.ukpunting.com/index.php?topic=8571.0
). Her profile is here (https://www.adultwork.com/1814907
). She appears to be running a special of £70 for 30 mins or £100/hr. If you see her, you need to tell her in advance you want her undivided attention for the time you are there and you don't want her answering her phone.
I haven't done a review of her, but you might want to take a look at Katalina (https://www.adultwork.com/1794674
). £50 gets you 30 mins or £70/hr. Not quite as thin as they other two. She is the girl in the pics though she looked a couple of years older than her latest pics when I saw her (and I do mean 2-3 and not 10). She's a great kisser and she really seemed to get into it though she was wearing some sort of faux piercing which limited access to her clit. She's Hungarian and speaks pretty good English. I had booked her a second time but she canceled me 5 mins before the booking was due to start and after I had travelled 45 mins citing time of the month though her phone number remained displayed in subsequent days. I would be sure to have a backup if you go see her.