"M&M" writes:
on a bench below a skylight in my bedroom. I need a tray about the size
35cm * 80cms to asccom approx 8-9 plants. Does anyone have any ideas on
what I can get to use about this size, I haven't noticed anything this big
in the garden centres.

You can get plastic trays around here that are meant for people like
me, who need to repot in the kitchen. The trays are about 35x40 with
5cm high sides.

If you have a local Ikea outlet somewhere close, they sometimes have
stainless steel roasting pans in their kitchen bit. They are slightly
wider (45? 50?) and only 55cm long.

You can also get yourself a slab of styrofoam, fibreglass and
epoxy. Coat the styrofoam on five sides, let it set, then wash away
the styrofoam with acetone or another solvent. This won't be pretty,
but it will work, and you can make it just the right size.

Geir