R1 geezer, in that scenario, you would limkely be charged not only with drink drivbing, but also dangerous driving.
Dangerous driving is defined as a deliberate act (ie you are driving in the knowledge that your manner/speed is dangerous). and as such would not likely be covered by your insurance.
Drink dirving, as covered by myself and flip flop is not necessarily reason enough to refuse a claim.
I don;t know how many ''I was only driving at 30mph when the deer ran out'' claims I see, when it is blatantly obviouss that the ****** was doing in excess of 60mph - people lie, we know it, it is not something we can refuse a claim on, nor can we reduce the amount we pay for it - this is a similar attitude to ''refuse the first offer'' - urban myth.
Each insurance policy contains different terms and conditions from insurer to insurer. Some insurers will not cover you if your car is stolen by a family member, some will cover you if you crash your car pi55ed. On the flip side, other insurers will cover exactly the opposite, both, or neither of the above scenarios.
I have never encountered a case in all my time dealing with total loss and fraud claims whereby we have sanctioned a reduced offer due to excessive speeding, talking on a mobile, etc - the ombudsman would not accept that behaviour, and as such our claims department would not do that.
The only likelyhood of a reduced settlement is whereby undisclosed convictions or claims mean we have to retrospectively increase the premium , or if the condition of the car means we will only pay a percentage of the repair costs.
You're talking absolute toss R1 - in the future, you may want to let claims handlers answer these questions and stick to bluffing your mates down the pub