provisional, of course. i don't owe them actual money until they get a confirmed valuation.
i think there urgently needs to be a general revaluation. my flat (built in 2005) is being taxed based on the estimated resale value that it would have had in 1991, had it existed. but of course in 1991 there were hardly any city centre flats, meaning it's really just a case of whimsy.