Yes now that I think of it, what Paul @Mol_PMB and @west_clare_wanderer say makes perfect sense. I was messaging back and forth, without buying or selling anything. I suppose it could have been seen , by a bot , to be suspicious activity. The reason I was messaging in the first place was that I was asking the seller if he could do a single track version of the footbridge I wanted. (The answer was yes) Anyway good news. After emailing them last evening and asking a human to look into the matter, I received an email at 4.30am telling me, "Great news! Your suspension has been lifted". No explanation. I then received a second automated email five minutes later asking me to complete a survey as to how my recent experience with Ebay went. You couldn't make it up. So i am back in business anyway. Thanks for the replies.........