Sorry but I don’t get this. The person named on the tenancy agreement has been a victim of identity theft and denies taking the tenancy.
So if the fraudsters did try to sue for illegal eviction, they’d have to prove they were the person named on the tenancy surely? As they won’t be able to they have no contract with the OP.
The identity theft victim is not going to show up in court claiming the tenancy.
The subletters are neither here nor there as they have have no contract with the OP and as the fraudsters themselves also have no contract, whatever they agreed among themselves has no legal standing surely.
I can’t believe the OP hasn’t already turned up with a locksmith, gained entry, told whoever is in there they have unlawfully entered the property and got them out obviously without force. Just sit there until they do. Call police if breach of the peace. Getting some sort of metal security door nailed over the door frame so no one can get in with an alarm if anyone tries to remove it.
Got to be cheaper than solicitors, going through the court system and the loss of rent.
Who’s named on the utility bills? The ID theft victim? So even more for her to deal with.
If the holiday makers call the police, they’d have to prove they had a legal right to remain in the property which they can’t! Holiday makers have no legal right of occupancy to a property!
If the fraudsters turn up, take photos of them, record them and tell them to prove they are the tenant named on the contract. Say you will be prosecuting them for fraud. They’ll soon scarper.
No way would I allow this to continue.