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.
Got mine from Oakland Garden Supplies, think the CD-60 is the equivalent product: https://www.ebay.co.uk/str/oaklandgardensupplies?