I've tried the tokens on Asda and Lidl trolleys and they worked with both. The tokens seem a bit fiddly. They did not work on the first Asda trolley I tried, and I had to do a bit of pushing and pulling to release the Lidl trolley. On the Asda trolley, I was able to remove the token after releasing the trolley but with Lidl I had to reinsert the chain before I could remove the token. Overall, I am satisfied since it saves me having to find a £1 coin to use a supermarket trolley.