I've trained my local stores to welcome my Brommie (Lidl & Co-op take a bow). They now get upset if I turn up without it.
I have the 'shopping bag' and eazy-wheels. Complete fold on entry. Pull round the store by the shopping bag frame handle so don't need to take a basket. Very smooth. Just fill the shopping bag as you go round, empty at the till, pay and refill. No 5p bag charges. Simple and fast and ensures you don't buy too much. But if any of you are looking to market a niche product - a baguette holder that fits on the block and doesn't bend the baguette on the fold would be very nice ...