Well... I think if you want one quickly you shouldn't waste your time trying to source a shitty box that is the wrong size, but get down to a joinery/cabinet making workshop and ask them for the 4 sides and base cut to size, and then glue and screw it together yourself.
You either need it to be covered in a good weather resistant finish, or at least have it made of a weather resistant wood. So not birch ply cos it'll go black.
It'd take a machinist 10 minutes to prep the wood for you, if they've got the type you want.
Avoid Travis Perkins at all costs.
Well... I think if you want one quickly you shouldn't waste your time trying to source a shitty box that is the wrong size, but get down to a joinery/cabinet making workshop and ask them for the 4 sides and base cut to size, and then glue and screw it together yourself.
You either need it to be covered in a good weather resistant finish, or at least have it made of a weather resistant wood. So not birch ply cos it'll go black.
It'd take a machinist 10 minutes to prep the wood for you, if they've got the type you want.
Avoid Travis Perkins at all costs.