Sorry, washing machines aren't the most exciting of subjects but I'm a) embarrassed for being so long term dim, and b) hoping to help someone avoid makng the same mistake.
For some reason unknown to mankind we've hired rather than buying a washing machine for around 10 years. We've now inherited a nearly new one so I phoned to ask Box clever (used to be radio rentals) to take it back, which was arranged. They've now phoned back offering to sell our current machine to us for £15! So they can't even be bothered to collect it, would rather sell it to us than dispose of it themselves and have the cheek to want to charge us £15 for the privilege.
Motto of the story: Don't hire for a long time - tell them you don't want it anymore, and they'll try and sell it to you!
Grrrr....