Laurie - I'l have a check in my database when i get a moment (it will obviously have the 1881 entry in but probably not the rest) and in the two definitive AINSLIE volumes - the AINSLIEs of Lasswade and of Dolphinton.
I've yet to get all the trees in them onto the system, so they're harder to search, but there are a number of AINSLIE families in London at the time, so I might pick up something.
Its also quite possible that they may appear elsewhere under another spelling - if you got the reference from the LDS 1881 census discs I'm sure you're aware of the appalling inaccuracy of it - but if you've not checked the films then I'd strongly advise you to do so!Remeber that there are 230+ spelling variants of the name - it can get misspelled or spelled differently in a LOT of ways!
I'll check anyway when I get time, but it wont be immediate I'm afraid as I'm very busy.
Best wishes Hugh Ainsley - the AINSLEY one name study