Hiya Maggie, see that you're in Wolvers......bit colder than me in Brum and I grow in my garden rather than a lottie, so might be more sheltered....3 sorts of carrots went in 10days ago.....2 sorts, maincrop, well germinated, the other 'Early Nantes' surprisingly, just begun....one or two seedlings to be seen - if you lie horizontal to the earth ;)
Anything you can do to warm the soil up a bit? fleece? cloche? as colder weather might be coming our way.
All the best, Lishka