"Didn't know you could do that. Have any cycle-specific-insurance-protected people on here ever tried claiming for pothole damage?"
Oh yes - you don't need to be insured either.
Need details of damage + location of pothole - photo very desirable.
Most people don't claim for bikes - probably because the don't realise they can - but also because (usually) cost isn't worth the hassle. Different if you've actually been injured though.
I don't hope anyone has been hurt, but I assume it would change certain practices (lack of) if anyone crashed on an uncleared off road path.
Though no doubt they'd have a defence of 'everyone knows we don't clear them so it's 'at your own risk' '...