Invacyl is the budget range.
We had an issue with one that put me off using any more. They feel cheap.
Centre brand have also moved to a new supplier, they feel cheap too, I won't use any more of those either.
Main/potterton/baxi are good mid range ccyls.
Joule cyclone are my favourite but...
Joule cyclone are good but steer clear of joule invacyl.
Santon Premier and old style centre brand were good. These are still available as main/potterton/baxi branded cylinders.
So that's £230 + vat.
Attend, bring along freezing kit, supply and fit a new valve, take on the responsibility of freezing and working on an open water main.
I don't think that's too bad.
Be careful pulling pins with grips or pliers.
The pins will easily pull out and then things get wet quickly. Best to tap them on the end and let them spring out themselves.