Tiggy and ihateparties in particular... Thank you for your wise advice, we're a month in and going so well that two of my pregnant friends are getting the same model! 
And for others who are looking for an easy to manoeuvre, easy to fold and relatively lightweight pram for city living and occasional country walks, I'd definitely recommend the GT.
We also got the large second hand bassinet from eBay, which is great - though it does make or quite a big and tall pram once assembled! It is very useful, though, DS likes it and it keeps him a lot more shielded when we're out and about. Its also good for the stairs outside our building as I can lift it off and take the bassinet and pram parts down separately - a bit of a faff, but our stairs are too steep to safely bump a pram down with a newborn inside.