Why not go to NATS? There where older ex RAF controllers than you on my course with NATS it was 6 years ago so dont know what the current situation is.
By 2008 I should imagine there will still be a shortage of controllers, proably worse than now. Many non NATS units, who in the past have relied on NATS cast offs ie. people with ADM but no radar, have had that supply cut off and will therefore have to fund more controller training. As you are experienced you will be much less of a risk of failure on the expensive courses I am sure someone would take you on. Try serco or individual airfields. VT aerospace would definetely considers you if they are short in 2008 which will probably be the case.
In regards to the bonds, even though they are not worth the paper they are written on, the consensus is that you should not break them because onther units would not employ you. Personally I am not sure this would be the case but really if a unit spends all that money on you I think you owe them a few years. However the bonds are only for 2 or 3 years so not really a problem.