Soil Block success ! Took some pics of seedlings growing in the blocks, there's psb, stem broccoli, leeks, lettuce, tomatoes, cabbage, and sprouts. Used this mix - 3 parts coco coir, 1 part vermiculite, 2 parts seed compost, 1 part soil and I sieved the compost first.
Used a heat mat/heated propagator to germinate in my unheated greenhouse, then removed into meshed trays. Found it much less hassle and easy to water using a gravel tray or spray. All holding together well. People from my allotment all interested too, a couple of them are trying it out as well. I'd already planted some of the lettuce out previously, and its doing well.