which is what the cab stuff says

Wait until the next time he goes out and then going to the house and call a locksmith that is it only communicate with him by text and when he wants his stuff he can't come round to house for it you will send it to him in a taxi ditto post , any further post that turns up put not known at this address.
If he takes you to court flatly deny having been in a relationship with him and say he was just a Down and Out friend who you were doing a favour for, no rent change hands and you said he could stay there for a couple of months while he sorted itself out and then he told you he had sorted himself out.
No marriage certificate no children no name on the bills no rent book the only proof he has that he stayed there is post turning up for him.
I'm assuming you did not put his name on the electoral roll or anything official

Is this a wind-up? They've lived together for 14 years, not "a couple of months" - the partner will have plenty of evidence of the relationship and his residence.

It's sometimes better to keep integrity and go through the proper legal hurdles.

If there has been any harassment claim psychological abide & get a restraining order. That way, he would not be allowed anywhere near you. I would also pay someone to get rid of those cameras. Definitely seek legal advice, & if it is confusing, ask them to explain it until you understand it.

Sorry for my reply this morning, I'm rubbish at giving advice, I apologise. I misread 14 years as 14 months too.

You really should have stayed put & not left your home.
He also, would have had to leave the place at some point, to go to work/shopping whatever, giving you the chance to change the locks & call police/seek an injunction against him, if he created trouble when he returned & found he was unable to get in.

My friend went to his property one day & found squatters in there. He was greeted by a voice through the letterbox saying they were now living there, when he couldn't get his key to open the door.
He immediately lost his temper & kicked the front door to gain entry. They soon left.

Is there any way you would be able to get entry by arranging to meet on the pretence of talking things through? That you still love him

Its a very difficult situation as you cant be expected to keep anyone, if they move into your property, but if they can prove that they gave you money (such as through bank statements) they could then say that, that money was towards the mortgage payments.
When people get together, they rarely think & don't draw up anything legal which would protect their property if things turned sour.
Maybe/hopefully you could prove that the money he gave you was far less than if he had rented anywhere himself, or was just for food, utility bills only? That he moved into your property to save the rent he was paying before?
Do you have another property? Could you not claim from him otherwise for any rent you would have to pay elsewhere while he is occupying your home?

Please seek legal advise & keep us updated

It would be cheaper to stay single, or rent out your property & move in with someone else, or even to rent/buy somewhere else with them, but keep your original property going. If you had owned your property jointly with a brother/sister or relative he wouldn't have any claim on it. I wonder if you could change the deeds? Then he would have to leave

Imo you cannot be paying the mortgage and not staying there. Why not just sell the property and if it is determined legally you have to pay x amount then so be it.

And then watch him turn around and do exactly the same.

Internet "advice", got to love it. Making false reports to the police, purgury, attempting to pervert the course of justice. This thread has it all.

Because his partner is still living there! They need to sort that out before any sale can take place.

Why raise this issue again when there was no shortage of advice some time ago?

Terrible recommendation, if he proves he was in a relationship (holiday photos, friend's testimony, invitations to people's weddings, photos at the wedding ) after you swore under oath then you're in for perjury and the judge is liable to find very much in favour of him