Tony
I admire your desire to ensure that those who have left HM's Armed Forces get the best possible deal in respect of their Pensions - but I am afraid that the position of HMG will be that the Nations finances are in dire straights and that all must "share the pain".
I have served with people who volunteered from the Dominions and Colonies to serve in the RAF who suddenly found out on retirement that HMG "reserves the right" to tax "Government Pensions" in the UK no matter where in the World the Recipient resides. Ex Service Personnel who retire and return to their Country of origin or emigrate after retirement will find that they do not receive the "Winter Cold Weather Payment" unless they were in receipt of that payment PRIOR to emigrating.
It would appear that the note left for the incoming Chancellor after the election which said "I'm sorry but there is no money" was quite accurate.