The committee volunteered to execute things on behalf of or as instructed by the other Lot owners. So get on with it. It’s a bit rich not to act expeditiously there after an AGM vote has decided upon some idea, but I guess things can genuinely get in the way. But if you took them to adjudication the word ‘reasonable’ would get a run and they’d need a good excuse for not doing what others have told them to do. As for the difficult committee member, you should be voting at a committee level after discussing any issue, putting it up as a Motion to vote upon, and thereafter if he likes it or not – on you go – with or without his blessing.