I check names but have never refused a card so long as the pin was entered. Not technically correct but we tend to know most of our customers. I also use my husbands card in Tesco etc. and it's never been mentioned..mostly because I put the card in the machine myself...and if I use his card at my own place of work I wouldn't bother to argue the point with myself
If you read the T & C of your laser card it should state that you should not disclose your pin no to a third party. The card should only be used by the account holder.
A retailer would be quite within their rights to refuse even if the pin is known.