Replaced wax capsule on my puma a couple of weeks back and everything was okay. Went away for a week back last night and the pilot had gone out when I relighted there was a strong smell of gas from the boiler. Obviously nothing to do with the wax cap' but nothing else has been touched. Turned gas off last night was hoping the smell was residual gas from the pilot but tried again today and the smell is just as bad. Anyone got any ideas as to the cause?