you can measure it yourself. Long ball of string, get someone to hold it on the floor under the end of the awning rail, feed the string into the awning rail as you go, right the way over to the other end and back onto the floor. cut it off or tie it, remove, measure against a tape measure and that will give you a number that should relate to the size of awning needed.
Amazing family weekend with old steam engines, classic car displays, market stalls, and full catering and bar. And camping on site - Save £25 by booking in advance.