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Thanks, that is a better price after postage actually.
Do you sit yours in anything? Was thinking of trying a hotbed type setup this year so big pile of fresh manure, cardboard and just sit them on that to avoid waterlogging, all covered over with a mini poly tunnel.
Polygon-
I have a couple of trays/clear covers which fit them. I bought them from Aldi about 5 years ago and they still seem to be working ok. For stuff like tomato, chillis, aubergine etc. I plant them in the seed cells and put them on a heat mat. For lettuce/sprouts/brassica. I put them in a little greenhouse shelving unit thing (also from Aldi). The covers help keep the moisture in but you just have to keep an eye on the weather on anything outside as they act like a mini greenhouse and young plants can get scorched. You can also get spongey mats that sit underneath the seed trays and absorb water to keep things from drying out.
Tonts
Got mine from Oakland Garden Supplies, think the CD-60 is the equivalent product: https://www.ebay.co.uk/str/oaklandgardensupplies?