There are very few sponsored schemes around now - schemes that guarantee employment, even less so.
Some institutions like FTE, OAA and Cabair have mentored schemes every now and again. Selection for these is tough and roughly 2-5% of initial applicants will get through to training. As far as I'm aware, part of the cost resides with yourself and part with the airline (generally at the later stages of training) for these schemes. If you meet the exacting standards and a position is available in the airline then on completion of training, you'll be offered employment. It isn't guaranteed, however.
Alternatively, CTC Wings Cadets are sponsored by one of their partner airlines. CTC say they've had a 100% employment rate from their Wings Cadets. Their finance information can be found here:
http://www.ctcwings.co.uk/cadets/finance.asp
You fund the security bond through personal finance or a loan from HSBC (unsecured), giving monthly installments to a CTC subsidiary. Whilst employed by an airline, the bond is transferred to the airline and you pay back the installments each month from money given (in one form or another) from the airline.