Pianos it seems are a thing you can't even give away, I occasionally see them smashed up in skips or in bits outside a house being refurbed or whatever. I found a perfectly good one just left in the middle of Kingsland Rd Hackney once, I had a play of it for 5 mins and walked away with great sorrow that I had no way to rescue it.
I do find it very sad that these things once so desirable (and expensive when new) are now just junk.
I've got an old upright thing here that I have a bash on very occasionally, which was a freebie locally, I made a kind of dolly with wheels and myself and a couple of mates wheeled it home. (it was only a few streets away)
Obviously a grand is a much weightier proposition to move.. Why not initially put it on ebay, gumtree, etc etc for £5 buyer collects, and see what happens, you never know.