after rangey sank in the ottery flood i had the becm removed and taken to lr4u in honiton for assesment/repair, got rangey back yesterday ater being told it was sorted and surprise surprise its got issues, 1. showing airbag fault. 2. message centre displaying windows not set ( tried resettng them no joy) 3. rear doors not locking unlocking on central locking system. do i count my losses and get the becm reconditioned £350 or do i take it back to lr4u who iv lost confidence in ? or is there something else i should be looking at ? car runs fine and drives fine, any suggestions advice gratefully recieved

Try another independant to hook it up and see if they can wipe the faults by looking at the relevant modules before jumping in, assuming it's all BECM related.
At least you have got the car running and driveable. The complete set of checks should take no more than an hour so work the cost out from there.
Keep us posted.............