Paul - what is interesting is that the recent announcement concerning future terms of service revealed that 'Professional Aviator Pay Spine' aircrew will receive a pension based upon 100% of earnings!! They've done this by binning the concept of basic and flying pay for PAPS (nice!) aircrew (the future term for Spec Aircrew) in favour of enhanced total pay. Hence it has been accepted, ipso facto, that such aircrew are indeed entitled to a pension based upon their total earnings - but the rub is that only those with 5 years or more to go to their retirement date can transfer to this scheme - hence a quirk of birth date will disadvantage the rest of us by a not inconsiderable amount. But I believe that there's a legal precedent over such things which may help.....
PS - Keep up the pressure regarding the railway!!