Yeah glass insurance is pretty standard with policies in the UK. You just pay an excess and the insurance company cover the cost - and generally claims don’t count against your history so don’t impact your renewal price (in theory).I had the same after a rock chip. I bought the windshield insurance. Replaced no questions.
I just booked my replacement for 16th Sep, under two weeks isn’t bad. Cost me £115 for the excess - the non-insurance price is £1800!!

Here it is, my second crack (so-to-speak)