We did it, though largely because a supposedly absentee freeholder had caused all sorts of problems with the purchase. In fact he wasn’t absent, just hiding a few miles away under another name because of debts attached to the FH.
It’s one of just 2 period maisonettes - owner of the other didn’t want to buy hers so we bought the whole.
There’s a formula for working out the price, based IIRC on ground rent, if any, length of lease, current value of the property. The FHolder can’t just name their own price. Plus solicitors’ fees. We eventually used a specialist, found via google, since the High St sol we used for the purchase turned out to be utterly clueless about this sort of thing.
It took about a year, but that was mostly because of Mr Supposedly-Absent pissing about for months, pretending he wasn’t there.
I’m glad we did it. It wasn’t cheap, but I think it’ll make the property more desirable, if only because any future owner wanting to convert the loft (next door’s is fantastic) can just do it, without having to ask the Fh’s permission or pay him anything.
IIRC you can find the formula via google.
Your GR sounds high! Ours was only about £150, though it was some years ago now.