bocadillo
Water Gypsy
When I looked into them when I got my invoice in December, I found examples of cases similar to Lako's but they refused to back down.
If they don't back down and it does finish up in court, it would be better to be able to show that you had made every attempt to pay the over-stay charge.
Do they have a legal right to do that?
I don't know whether they have or not. If a garage has done work on your car and you refuse to pay them for it, they have a right to keep your car until you do - something about tort applies. But if they do let the car go, they have no right to impound it when you make a future visit (perhaps to fill up with petrol) So I would guess that Moto (or whoever) have no legal right to do it - but once they have that clamp on, they have the advantage at that moment. You would at least be heavily delayed whilst they undid it and the it would be you that would be faced with court action to try to get your money back.