Remember unfortunately if you don't help them, they will have to pay out. The 3rd party will provide witness statements and evidence of damage. Your premium will go up.
Admiral will have nothing to defend themselves on your behalf.
Crucially remember that they are an agent on your behalf. They are just covering your liabilities. You can't just ignore this or not make an effort to defend yourself. This is an accusation against you, not Admiral.
If this went to court for example, you would provide evidence you weren't in Wigan, have no matching damage with an independent mechanical report etc. and you'd be doing this out of your own pocket.
There are also many people who do get into accidents and then feign ignorance.
Interesting, do you have specific knowledge in this area, I struggle to see how a claim can go through,.
If this worked we would be swamped with people making bogus claims.
Surely the claimant would easily get done for fraud , seems unlikely to me.
Sounds like admiral have got confused and don't want to bother checking, I would just keep saying you weren't there, must be someone else.