TD5 alarm immobiliser problem

For the past couple of months everytime i've tried to unlock my 90 with the fob the alarm sounds, whether i've locked it with the fob or the key. I'm hoping this isn't a main dealer only issue as it's a 6 hour round trip to my local dealer. If anyone else has had this problem, how did you sort it?

Sounds like the key FOB has lost sync with the alarm unit, your manuel should tell you how to resync them.
If not it will need to be programmed at dealer.

Thanks for the reply, tried resyncing with no luck. I'll give land rover a call tomorrow.