Thanks @eeeefarm, the half of the battle was in my head fighting why is he doing that.
I have been told to hold his muzzle down if he attempts to bite.
I think it's time to take hold of the reigns properly and stop thinking I am being mean!
Okay so my pup is 9 months now and I thought we had the chewing business nipped in the bud but it turns out, yesterday he started to chew on the end of the skirting board. Please can someone advise how I can say and make him understand "don't do that" or that "it is wrong to do".