Mortgage company will require you to have buildings insurance. That’s all you actually need for them to give you the loan.
Everything else an estate agent / broker etc will say is rubbish, and you don’t have to get the insurances from them no matter what they say. Life insurances, contents, and all those payment protections you must have etc. All that is why we have PPI lawyers and so on. A whole load of mis-selling, and it’s still going on.
What you actually need is down to you though. Buildings and contents definitely go for. Accidental damage cover is down to the insurance and may be optional or included.
How much it costs all depends on the building value, type, location, nearby risks like flooding, how much contents you insure, whether you want accidental cover on top, away from home, bikes specified (varies on insurance whether you need to), etc.
Life insurance really comes down to whether you have dependencies and assessing can they cope if you die. Separate stuff they’ll push on you is death/critical illness insurance which pays off the whole mortgage in those circumstances, plus PPI on top. Then they try to get you to pay for redundancy insurance which pays your mortgage payments, which not only is a mortgage PPI but can have PPI on top to cover itself! Watch out with this as there are many exclusions which stop or delay them paying it.
Basically be very careful and go through whatever you get with a fine tooth comb, especially if you take what the agent pushes on you. Chances are very high, as I found, they are unnecessary, if not also invalid when it comes to claiming.