Harvesting home grown lettuce

I was hoping for a more mixed crop of lettuce but the fact that we are producing enough lettuce to take it off our shopping list is awesome. Next sowing will have more red leaves and some more peppery varieties. I am interested in finding ground cress seeds, which are available in UK. Tastes like water cress but grows on land. Pepper, tomato and cucumber seedlings are coming right along too. Maybe a bit cool and early even in the new upstairs greenhouse, but we are going to give it a try.