I would recommend the Stewart Z3 solid trolley and 100% reliable I purchased mine 18 months ago and still as good as new. At the time I decided push over electric however am now going over to an electric trolley.
Powakaddy Twin line 4 folds small, especially if you take the back wheels off.
Room in my boot (Citroen C3) for trolley, bag, clubs, shoes etc etc etc....
How small does it need to be..?
Thanks everyone for your suggestions, all very helpful and I looked at all models before talking to our Pro at the golf course. He did me a smashing deal on the Big Max IQ+ With Umbrella Holder. I would have preferred a Stewart R1 or Z3 but afraid budget would not extend that far.