The only "official" stickers I've got on mine are the small BSAC nitrox stickers (with the diamonds) and an O2 clean.
If some-one wants to put a huge nitrox sticker with their shop name on it I won't argue so long as I get the sponsorship money first. 
Cheers
Andy
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"When the Government fears the people, there is liberty. When the people fear the Government, there is tyranny" - Thomas Jefferson |