Bought the capillary matting last year on a roll, it's great you can cut it to fit any sized tray.
I agree with Red Dahlia, the Garden line seed/cutting compost is lovely. Got 20 trailing lobelia plants for £2 - great plants that should be flowering by the end of the month (sunshine permitting!)
I got some good stuff but, after reading this, I'm going back!
My local Aldi has some 6-8ft/2m ornamental trees - Hawthorn, Japanese Cherry, Field Maple etc for £4.99. Veryy good looking trees with good structure. Good if you want to screen something or one!
I bought 10 mimulus and 10 viola's for 99p each tray of 10 and they are really healthy plants. it was early Thurs and some were not as good. Imagine anyone going day or two later they would have been rubbish. I am pleased with what i get at Aldies. B&Q Verve seed and cutting compost 2 for £10 I am very pleased with too.