I've recently seen a Lien fixed to a yacht by or on behalf of a boatyard for unpaid fees. The owner is absent/missing/untraceable or whatever. The interesting thing for me was that the sum of money outstanding was "estimated" to be x pounds. Knowing the law a bit I wouldn't have have thought a court would have allowed anything other than an exact amount at a certain date for a certain period. The other thing that was a surprise to me was the relatively small sum owed, at least in relation to the value of the vessel.Is there a concept of reasonableness?
Regarding Liens. Are they a court process anyway? what is the procedure?