Had similar experience to Frank some months ago at Sainsburys - and not having any cards on me I tried putting notes in the machine to pay. Several were rejected and very helpful staff were left scratching their heads. Me, in a mood, and with visions of still being in the bxxxxy shop at closing time decided, 'let's forget it', and walked out leaving everything on the counter, and went round to Waitrose. In and out in no time after using the friendly checkout.
I felt guilty about walking out of Sainsburys and leaving the staff to clear up - they're friendly girls just doing their jobs and I'm a Grumpy Old Man spoiling their day - but when all is said and done, action is the only way some of these know-it-all suits running these places might realise that customers come first and ultimately pay their wages. Let's send them some E-mails and tell them why more of us are getting fed up and going back to the little shops ( perhaps higher prices, but much better service - and usually better quality )
Well, that's off my chest, a good rant first thing on a Monday - the week has to get better ( but don't mention the weather! )