Not exactly guys.
EN 1949 (fixed 30 mBar regulator) is a European standard, but it wasn't imposed by Brussels - it was created by a group of people from the caravan industry.
EN 1949 wasn't the problem per se, it was the way it was implemented in UK caravans that was wrong. There are three steps to getting the gas from the bottle to the fixed pipework, and even getting only one of those right would have "cured" the problem, but they managed to get all three steps wrong.
EN 1949 has nothing to do with the the environment, and a lot to do with using one regulator for any type of gas, and getting the regulator out of the hands of enthusiastic amateurs or people who drop stuff on the floor...
The old type was not "better" oil could still be leached from the flexible pipe and find it's way into the rigid pipework.
And it's illegal to back convert from EN 1949 to the old system - but that's only important if you have your caravan serviced.
### Note to Geoff:
If all you did was to simply replace the regulator, you might like to clean the pigtail hose by washing the inside with warm soapy water and then drying it - this should remove any "oil" from the walls of the pigtail - and stop it building up in the regulator.
And if you kept your old regulator, the same warm water (50 degree) treatment should loosen the oil contamination from the diaphragm and return the regulator to normal use. You might need a foot-pump to blow the water through the regulator and then dry it out afterwards.
Robert