Quick update, RAC came and did all the things I had learned on here. I.E disconnect battery and wait a couple of mins, unplug the module etc. Still no luck. I asked him to check the battery and under load it was showing 12.2 volts which he said was good. I thought I read somewhere that anything under 12.3 volts can start to cause problems. Anyway off he went and I was back to square one. Just been out to the car and started her up , Don't know what made me do it but I opened the boot and disconnected the module whilst the engine was running. Left it for a couple of minutes and plugged it back in and hey presto EPB is working fine. A warm feeling of deep joy overcame me, the cat is back.