The chair is a Slouch Task One Black with a grey seat:
https://slouchonline.com/product/task-one-black-frame-with-arms-fog/
It is less than 8 months old.
Perfect condition apart from the fact that the lower seat position adjustment arm fell off.
The chair is still usable, and perhaps a handyman could fix it?
The seat shifts a little forward and back when you sit down or stand up, but remains in place when you are seated.
Giving it away because the Slouch company gave me a free replacement.
Collect from near the Co Op in Chippig Norton.
Slouch Task One Black with grey seat Office Chair (Chipping Norton OX7)
This offer has been gifted to someone and is no longer available.