A quick search on adultwork shows that in Merseyside 55 female escorts have A Levels on their likes, 59 have it on their likes ‘At Discretion’
Out of those Poppy is the only one that I have fucked in the arse, she’s the only one that I know includes it at no extra cost but you do have to let her know in advance of the booking take place that you are interested in A levels
Out of the others the only one that I’ve heard anyone pariticipating in Anal with is hotgirlforyou100, though she does charge extra for it, and I’ve never seen her myself
Im fairly sure that Layla Fox will do it at an extra cost, though I’m not sure what that extra cost would be, a couple of years ago she stated it was an additional £20 on top of the booking fee, though I’m not sure if that has changed
Hope this is of some help