After having looked at the government website advice to leaseholders it states that if you have already agreed to the charges ( which
payment would be counted as ) then you cannot challenge wrong billing, unsatisfactory work or the need to pay the bill at the tribunal.
I have just written to Camden stating that their new idea of charging ahead of completion of work stops us being able to legally
challenge our bills or work.
They always come back with some clever answer which has been run past their lawyers I know which is why being a leaseholder for a large
bureaucracy is getting more like living in a Kafka novel but you never know.