Thanks I read a couple of post and I've disconnected the battery and hoping that's it. Just having a mad panic this morning.
I contacted the seller and he was sound. He put a new battery in 2 weeks ago so my feeling is that,that reset the ECU and its then caused the issue. Could be wishful thinking but he sounded honest enough.
Bloody worrying when you don't know about it. People behind me weren't best please either.