Loads grow in coastal locations. Like wild fire actaully.
When we visit friends in Suffolk we use the sweeter, softer, bottom 200mm or so. Any really fibrous strands are pulled off. The earlier in the season you can eat them the better - They just become too bitter and tough. These are washed, steamed and butter, salt and pepper is added. Its a great veg to have as a side dish or just on it's own. The flowers (later in the season can be made into fritters, but I haven't tried this dish.)
Yum...!