Dan Solo, Cabair also does/ did a sponsorship if you had 100 hours and some other requirements. Instruct for 2 years then work for KLM UK.
But, if you are looking for a CPL/IR (airline work), then you will need to first check with the CAA about JAA rules. The self improver route is about to be abolished, however there is a rumour that it has been given a bit longer. You will need to do a Class 1 medical first, then you need to do ATPL Navigation exams, Technical exams, gain 700 hours, do a GFT and do an IR in a twin. To be an instructor you need to do the GFT and the exams and do either an IMC or IR, I think. The course is not cheap - allow c £4000??? for AFI rating, c£6000 for IR, c£1500 for GFT, exams are up to you - self study or full time course. All plus huge CAA fees.
There are many other options - you could buy a share in an aircraft and hour build, you could work full time in your current job to pay for hours, or you could instruct. You also could consider the USA for much much cheaper flying. There have been many previous threads, check out the archive. If you need me to expand on any of the above, post a reply or e-mail me.