Chase Caravan Services springs to mind if he's still going?
But in general and only if your competent to remove it and re-install it? Then turning it on it's head for 15 seconds and right way up again for the same time, repeating a few times, gets it working again
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.