I tried some more 4-6 yrso seeds including chillis, squash, melon, basil - nothing, not one.
I now have 10 large tomato plants (2014 seeds) and around 20 getting bigger; itching to get ouside. Will probably plant out 5-7, swap some with the neighbour for other veg plants (they have allotment), and the rest will go ouside for passersby pickup...