If it's the really small silver one I wouldn't bother. We bought one at the start of last season and it packed up after two days. Took it back to the store local to where we were camping and they exchanged it for another one; that lasted a couple of hours. Gave up and bought a larger one for £49 reduced from £69 and it has worked fine ever since. Maybe we were just unlucky, but worth knowing before you make a decision.
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.