On average, the Government had paid 19 % more than official land valuations for new sites, with 20 of the 175 sites purchased so far exceeding their official valuation by more than 6 %. (teachers.org.uk)
We arrived at that official valuation via a highly extensive scientific process consisting of «that's what Scott says they're worth and he's a scientist and owns this blog so shut up and don't argue with him.» (travelcodex.com)
Although your insurance provider probably will not request receipts for every one of your insured possessions, you may be asked to provide receipts or an official valuation of your more expensive items. (rentersinsurance.net)