I have power going to the ecu fuse and relay and the relay is buzzing ect, ended up just throwing in the towel can't be bothered looking anymore tbh I'm gonna phone the auto electrician out that fitted the alarm and see what he thinks.

Thanks for the input though it will be something stupid like the original immobiliser as the new alarm looks sort off piggybacked through that. I thought by plugging in a spare immobiliser unit it would rule that theory out but maybe not.