Chris

Yes I've tried numerous local sheds and suppliers.
The type I am looking for are similar to those you describe, but without the
open section at the top.
I've seen them on web sites, but the only supplier I've found imports them
and is out of stock and in any case doesn't have suppliers around Hull.

I am only looking to buy one panel initially, so to pay delivery from
outside the area would make this a costly option.

Phil