Mark,
back in 2012? we were travelling back from France, the rain so heavy that the van dissapeared in the spray behind. Next day after getting home I emptied the front base lockers of our 310 and found the wine boxes and the floor wet. I unscrewed the front cabinet work and discovered the aluminium trim around the back of the gas locker had not been sealed correctly. I dried it out, cleaned it down and sealed it all with Geocel Trade Mate Roofers Seal Lead Grey from Wickes. https://www.screwfix.com/p/geocel-trade-...rey-310ml/72630 This solved the problem.

Colin