I think the £50 would be a fairer choice or even the £20. Alan Turing on the brown £10 does not seem the best choice of note perhaps. The £50 is pinkish and the £20 a purplish colour. I personaly like the £20 the best astheticaly.

For reference on UK bank notes: http://www.bankofengland.co.uk/banknotes/Pages/current/defau...

It is also worth mentioning that Alan Turing is already approved to be on a UK bank note and is on the waiting list so to speak as seen here:

http://www.bankofengland.co.uk/banknotes/Documents/about/ban... (those names highlighted in dark grey have already been used upon a banknote)