Bart, As you specified "airmiles" and you are in the UK I assume you mean BA Exec Club/Airmiles.
Airmiles are not transferable, however, you can make bookings for your spouse/Mother/Father/Children using you AirMiles even if you are not travelling (in reality anyone with the same surname as you is no problem).
You may combine you AirMiles with someone else who IS travelling to attain an award.
MF