If they have commited fraud, which they have NOT, it would be up to their pet insurance people to take action.
They DID have pet insurance, but may have had an excess to pay which they can certainly recover from the gulity party, through the courts if necessary, BUT only if over a certain amount.
If they are now trying to get back monies which they say has been paid out of their own pockets, but wasn't that is a matter that can be dealt with by their insurers if they want to, very unlikely.
As they have NOT (yet) received any reimbursement, then the only offence that could be would be ATTEMPTED fraud.
I can absolutely gaurantee you the plod will not be interested, but as said they certainly are able to claim their excess if any.
I would NOT listen to the plod, too much if I were you, they may well not know the whole story, and are quite good at getting things wrong, and at stirring the poo.
If I were the dogs owners who were hurt I would give the other attacking dogs owners details to the insurance co as it was not under control.
The plod should also have taken action under the dangerous dogs act against them.
If one is now sunsequently claiming to have been bitten, they would stand no chance unless it was suggested at the time, and medical evidence obtained as to the extent of any injury.
tabetha