"No, I've got two of those and a bivvy, I want a brolly with no pole etc. etc.?"
Demanding lad aint he? The brollies without central poles, but with sides are similar to my Fox Oval. These are like this:-
As for your Grandslam Barrow, it looks quite like this one:-
<a href="http://my.frooition.com/070324/images/Carp-Loader-Barrow.jpg">
</a>I know these do fold as I have one quite like it. Not quite as expensive as the Grandslam, but then you have to factor in the P&P. The back legs fold, the front support tips back almost flat, and the wheels swing under and backwards, so it is about as flat as it can get. Oh yes and the handles and wheels come off if you really need them to.
BOF 