Yesterday we detected a gas smell in the motor home so we tried the usual detecting stuff. got it down to the cooker so turned off stopcock to the cooker and all other appliances turning them on one by one. Decided it was definitely the cooker. Smell coming from around seal in sink. No smell in small cupboard between fridge and cooker. Turned everything off and called a caravan servicing engineer. He said he will come today at 4pm to do a gas test leak. No smell leaving the fridge on gas. No ehu for back up. Today all smell gone so switched on all stopcocks again. No smell. What could have happened? Wind direction has changed so maybe under van?