Plastic, fabric coated Greenhouse.
The greenhouse is a "Christow" unit.
See the "extra large" version, shown here: https://www.christowhome.co.uk/large-walk-in-greenhouse+size-extra~large
The green house is dissasembled but a bit bulky so car transport required.
The cover looks in pretty good condition (1 season) but could do with better folding for storage (it's currenty loosely bundled to prevent damp).
The poles are metal.
Comes with about 8 mesh grills for the shelves.
Can be pegged down (not included) and has guy rope fixing points.
Assembly instructions for a very similar unit included.

Stafford, near castle.

Greenhouse (Derrington ST17)