Davjet,
I do not know your current situation, whether you are working somewhere other than aviation, and what your family status is, but it is largely true that most of these jobs are never going to be advertised.
The positions will be filled with pilots who get recommended by current crew or ops people.
Again I do not know, but have you considered working a ground OPS job with ANY operator or at any airport? Not sure about England, but here in Continental Europe a lot of companies are short on dispatchers and your flying education would help a long way there already.
This may not get you into a jet, but it will open up the chance to get to know people who may just remember and recommend you if a position gets open.
Being kind and helpful usually goes a long way in this small industry. You see it on here already, Mr. Mutt already helped out (including myself in the past via PM) and who knows what comes along.
Keep your head up, and so will I and many more. Our time will come (again).