Here is a Carrera Kraken. Another bike that has been bought, ridden about 100 miles, then lived in a shed for a few years, albeit fewer than the Grisley I'm selling. It's very well specified, with Tektro Io disks front and rear, 27spd Deore transmission and a surprisingly competent adjustable Suntour suspension fork. Triple butted aluminium frame in 18” flavour. Probably about right for a 5' 10” - 6' 2” person.
This is £150. No Paypal, or dibs, but make an offer as I like a laugh and you never know. This is a really good bike; perfect for seeing if you want to try a mountain bike, and with good enough parts that it's worth upgrading as you go along. It's in Derby; postage is really a hassle, so I'd prefer if you collect.