Ring culture in the GH

Slugs don’t like going over the fleece but they still do, I’ve discovered. It definitely helps and it’s good for stopping weeds and helping keep ground warmer, I think, I might be wrong. And any bits that need replacing can be fed to Mr greedy. He will like that.
Your carrots will like growing in 30L pots of old greenhouse compost. So how many varieties of carrot do you have to choose from? 

A new game! Winner gets a smiley face and an opportunity to gloat. Veggie  you can play but only before you count, and we may disqualify you if we feel like it 
Guess how many packets of carot seed  Veggie has to choose from:

My guess is 63.