A search looking for the keyword 'sponsorship' in the thread titles of this foum in only the last 3 months reveals
these results.
As you will see, no conventional airlines in UK offer a traditional sponsorship, where you undertake training entirely at their expense with no financial risk to you if you fail. There is the CTC scheme (search for it) which lends you the money to undertake their training, then (hopefully) places you with an airline where you then pay back the loan out of your pay. CTC also operate a similar scheme for a few airlines (eg easyJet) who will have selected you before you enter training. The financial aspects are the same, and you should understand that the responsibility for the loan (or the part of it used to that point) remains yours if you fail the training.
Oxford, FTE and Cabair are offering, or intending to offer, broadly similar schemes, but you will not find any sponsorships.
The sole exception is the Air Atlantique 'Fugly' scheme, which is more like a traditional apprenticeship and will only appeal to relatively few in this jet-oriented age!
Scroggs