I've got a 40/41MHz RF module in one of my Txs from when I lived in France, however I can use it over here for ground use as long as I only use a UK ground frequency, (a choice of three

)
While several European countries did/do allow the odd 1 or 2 channels on 40MHz for flying it was only the very brave that would use them, everyone else used 35MHz, (the European RC flying frequency) or moved over to 2.4GHz.
France was the only country you couldn't use 35MHz in and
had to use 40/41MHz for air use, although many flying clubs allowed the use of 35MHz by expats, (and 75MHz too

), before the FFAM started getting it's fingers on the re-allocated 35MHz channels, (when I left at the end of 2009, they still only had 2 legal channels on 35MHz, but I believe they have a few more now, although most flyers were moving over to 2.4GHz when I left.
Mark.