On-One Bootzipper 650b: £499.99
https://www.planetx.co.uk/i/q/CBOOBZ650SX/on-one-bootzipper-650b-sram-sx-mountian-bike
This is the bike I wish I knew I wanted 3 years ago. Steel XC bike.
No suspension but that is easily changed. I already have two bikes in this niche but this one is much better.