Truma secumotion gas regulater
Had problems with gas supply on last trip out two weeks ago. Decided to eat in on return from day out, problem was, oven would not light !!! 
Changed bottle for a known full one, still no joy.
Had cold supper that night. on return home three days later, went online to look for info on problem. It seems that Truma had a very bad problem with their regulators, at one time they were replacing them free of charge due to failure rate!!!.
To cut a long story short , I have now replaced it with a GASLOW300 Universal regulator with a 5year guarantee. Very easy switch, leak check etc. Mhome is only three & half years old, we bought it in 2012 with 1500 miles on clock & habitation side never used due to serious illness. This was only the SECOND bottle of gas used though it was not empty. As we dont drive with gas on we dont need a secumotion protection system. I'm happy now in the knowledge that our gas system will work when required. Has any one else had this problem? 
Hope this helps someone in need.