Yes Julian Cardiff is not closed at night and is H24 with ATC cover, love to know where you get your facts from
As for Bristol the work should be finished soon in time for the Summer schedules as I understand it , Standard Noise please correct as you see fit on that one. Any changes to rosters has to be agreed locally and takes considerable negotiation and ballots etc for what is a relatively short term project just a matter of a few months.
I'm sure many people took time to try to catch up with the masses of paperwork that NATS now produces for ATCOs on the Night shifts during the construction work.