Has he been given the right training? Inducted properly? Relevant safety training done? Enough time to get to know the role? It's only been six weeks
I got fired once, a week (or maybe two) into a new job. The bitches hadnt trained me, just expected me to be psychic. Dismissed my questions and were generally all round dicks! Gave me no chance at all and I had to fight them to pay me my notice (was marched out middle of the day). Big famous publishing house. Bet they're still there.... Hags
I digress!
I would want to make sure everything has been done by the book but if it's just been a bad hire then it would be ok to get rid, fairly, with decent notice paid.
They don't sound like a good employer - not sorting contract so maybe they haven't done the training,inducting, mentoring etc