MY PARENTS ARE MOVING FROM A THREE BEDROOMED HOUSE TO A PARK HOME AND HAVE BEEN TOLD THAT THEY WILL NEED THE JETS ADJUSTING ON THEIR EXISTING GAS COOKER TO COMPENSATE FOR THE CHANGE FROM MAINS GAS TO CALOR GAS. IS THIS THE CASE AND IF SO HOW IS IT DONE AND IS IT A CORGI JOB? CHEERS!