I just noticed £10 missing from my account today too, but on checking back I discovered 4 x £10 payments had been taken over the last 5 months. I had never heard of the company either and had no idea what the payments were for. I contacted my bank who are issuing me with a new card to make sure no more payments are taken.
Not sure if this is some kind of scam or if it is legal. The amount is small enough for most people not to notice, I just happen to have become unemployed recently so I'm counting every penny, but I hadn't noticed the previous payments coming out.
The bank also gave me a number to call, 0800 389 6960. The girl who answered offered to refund 3 of the payments by bank transfer and if I wanted to claim the fourth payment I could fill in a form which she will email me.
Apparently this is a Swiss company who add a form on the purchase page offering complete savings on a range of goods. I am sure I have seen this on ebay and thought it was for ebay savings. I began to fill it out but when I realised I had to pay a monthly fee I cancelled out of it and didn't complete it. Or so I thought. I certainly did not put my bank details on it. However, in my case it appears to have been a catalogue order which I don't even remember placing.
Other companies dealing with this Swiss firm are numerous, it could be you purchased air or rail tickets or from shops like Argos. Or possibly ebay, I'm not sure.
Hope this helps you. It is a freefone number and they did answer within a few minutes so you shouldn't have to wait forever. And don't forget to contact your bank too.