Apologies if this has already been said, but I did a quick search and couldn't see anything. There have been several cases of Clubcard vouchers being used fraudulently - there was an article on the Money Saving Expert email last week, and I just checked my balance to find that £120 of vouchers had been used hundreds of miles away from where I live. Tesco are reimbursing me and passing on details to the police, but do take the time to check to make sure it hasn't happened to you!