I could guess, and probably be right, but that would be unfair. And also, it's right in my opinion that Northolt and aero shouldn't discuss why moderation decisions are made on the board - that only causes problems for them when people either disagree or see any discrepancy on how they deal with people.
That's for the mods to determine. However, Andy is responsible for his own actions, and whatever he has said to whoever, he kinda needs to stop it if he wants to come back. Then, it doesn't matter what anyone else does, he'll be OK. Certainly setting up alternative log ins isn't the way round the ban, as he's already found out...