So, got there about 17:30.
Spent about thirty minutes using apps in slit screen, trying to simulate a real working environment. Had a go with the pencil (brilliant but doesn't stop me being a dreadful artist) and keyboard. Found the keyboard really responsive and easy to type with. Thought it would be much heavier than it is.
The screen is just gorgeous and its filthy fast all round.
I was sold. Got a Space Grey 128GB Wifi model with the grey cover.
At about 6pm they had no Cellular models, no pencils and no keyboards (but they sold out of those on Wednesday according to the guy who charged me). They had no gold and only a few of the one I got left.
Set it up from new instead of restoring from my iPad Air. Really pleased with it so far!