The Amenity Trust has for some time had a "preserve everything" philosophy (which is admirable) which had to hit a brick wall at some point, and now it seems to have done so. Becoming involved in high investment/high maintenance projects which provide little to zero financial return over and over again cannot avoid emptying even the deepest of pockets.
They've tried to maintain a too big portfolio now for a long time, and too many of those are ravenous money pits. Old buildings and old boats are fine and well, but they might have been wiser to be more selective and realistic in their aspirations, and learned from those who have done it before them elsewhere.
The country is full of old crumbling piles that lack funds to stop them falling down, the only ones that are surviving are those who have found some way to diversify in to "selling" something to enough of the public to pay for it themselves, and likewise with boats, while keeping one or two seaworthy seems viable eleswhere, a fleet is something completely different, as the old Nil, Brenda and the rest are testament to.