Planechartering are/were operating under the AOC of Xclusive Jet in Bournemouth. Having operated under Xclusive's auspices I am happy to say I have no argument with them, quite the opposite. Planechartering on the other hand did not exactly fill me with joy during our (brief) association and I made my way swiftly in the opposite direction.
Sitting firmly on the fence the difficulties I encountered might have been just teething troubles. Their origins are, I believe, in the world of boat charters and certainly when I dealt with them they were somewhat........vague in matters aviation.
I've had no dealings with them for over a year though and would bow to the opinion of someone more recently associated.