It'll depend on a lot of factors, insurance company, values, value of the claim (at a guess, they're more likely to investigate a 2k claim than one for £200), your insurance history
We're second guessing them though, of course. Better to be safe than sorry IMO...
My years premium for the following was £220 or so;
£5million public liability
£10k kit cover (£1.5k single item limit unless defined)
£100k professional indemnity
with Aaduki