After 2012 there is a change in responsibility for certain works, it
reverts to the utility companies.

However since the insurers are footing the bill I would sit back,
relax.
Although check what excess there is (£50 £100 £250). The only comment
I would make is ensure the contractors are competent in shoring up the
hole adequately (so a cave-in does not affect the house) and you have
a contact telephone number for them, not just your insurer.