Man of Honour
Indeed, I've been there many times. Also once when I was confident it would work (it was about £45 ish) - Turns out the retailer had put a hard limit of £30 on all contactless. Made me look a bit silly.
Which is why it would be nice to have a sign or something to tell you of such limits.
If I knew how to app dev, I'd make an app that notifies you using google location services when you walk into a shop that has a hard limit of £30.