Gas isolation tap

Hello

Taking our Bourton to France next year via the channel tunnel , the question is , do you isolate the gas at the isolation valve at the tank or in the the 3 valves in the wardrobe , I

know which is easier to do ! just wondering what they ask for at the tunnel etc . thank you , 

Cando

According to AS turning off at the manifold  (in your case in the wardrobe) is sufficient  to satisfy the officials,  it's stated on page 26 of the coachbuilt  handbook 2021.

I would suggest at the main valve. I have always done this before travelling by train or ship. 
I believe Peter Brown if my memory is correct, mentioned on this forum about the smell of bacon on one of his crossings, he was asked if it was him, so obviously someone did not turn off gas or only at the internal valves and decided to cook while crossing. 
I hope I’m never on the train with an idiot like that.

Your memory is good, It wasn't obviously a camper but a panel van with sleeping and cooking facilities built in.

Hi.
Been to France twice this year.  And just   showed them that the gas was turned  off at the taps inside the van

When crossing on ferries it seems much depends on the official giving your van the once over after checking in. Earlier this year we were specifically asked if we'd isolated the gas at the bottle, which I had done whilst in the queue. We'd never had this mentioned on previous trips.
This was the same official who asked if we were carrying a knife.... Obviously ticking off on a list.
I've never used the tunnel, but I imagine it's much the same.
Al.