Just noticed this whilst doing an online shop. If you have loads of carrier bags lying around and keep forgetting to take them to the recyling point then all tesco home delivery drivers will take the bags for you. This my or may not get you green clubcard points but chances are if you're getting a home delivery then it's more convenient for you anyway.
T&C Here and same in link -
"Our delivery drivers will now accept all carrier bags back for recycling, not just our own. We are also pursuing a number of trials to see how we can reduce and possibly even eliminate the numbers of bags we use in a home delivery."
Hope it helps someone.