Thanks for the reply. No feeding. They are up in the attic behind a silver-papered board to intensify the light but the days are quite gloomy, so not too much heat and light. Could I be overwatering them? They are in little peat pots.

Anton

Have they been in the sun, near the window perhaps.
Leaves tend to curl up with heat stress, or over feeding... But doubt you've fed them when they're so small, unless you added feed to the compost?

Most Mediterranean herbs will tolerate cold but the wet will really challenge them. If you can improve drainage (add grit?) before replanting, that might help

Visited plot this afternoon once the rain stopped.
Raked 3 beds and spread with multipurpose compost.
Planted some red onions as the soil is actually now workable.
Also planted out a strip of lettuce as mine seem to be rather behind.
Pleased to actually do something constructive after the annoying weather.

 3 again tonight