An e-petition: “Put Alan Turing on the next £10 note” has been posted on the Government e-petition website. The text of the petition reads:

Alan Turing is a national hero. His contribution to computer science, and hence to the life of the nation and the world, is incalculable. The ripple-effect of his theories on modern life continues to grow, and may never stop.
The current Bank of England £10 notes are Series E, but Series F notes are already in circulation for some denominations. We therefore call upon the Treasury to request the Bank of England to consider depicting Alan Turing when Series F £10 banknotes are designed.

Source: e-petition: “Put Alan Turing on the next £10 note“