It depends on whether the French site has the older domestic type of site socket (ie two pins and an earth socket on the plug you put in)
OR if it has the newer and increasingly more common Euro blue type of socket.
SO what you need is one adaptor to cover the first situation that converts the old type French socket to the newer Euro blue socket and thus your existing van lead.
If when you plug in the polarity tester in the van etc you have reversed polarity you then put in your reversed lead (clearly marked) which has a blue Euro plug at one end and a blue Euro socket at the other
When confronted by the Euro socket on the site electrics follow the same procedure but without the first adaptor.!!
------------- John
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