Hello. This is something I researched alot. I bought an adventure a1 from amazon and sent it back after 1 4 hour trip out. My boy was 2 then. It was uncomfortable and he slipped off the seat when he slept. The buggy kit was expensive and poor quality in my eyes. I've demo'd the the hallfords one too and in retrospect it wasn't any better. I ended up buying a croozer 1 blue. It was about £250 but worth every single penny!!! It's a class above!
http://www.croozerdesigns.com/kid-for-1.html
The wife uses it almost every day because of the versatile buggy kit. It has great storage, great visibility and space for Josh. (nearly 3 now and very tall for his age). It has an extra 12" front wheel which was perfect for our beach hol in France this year. In fact i think me and my wife both said it's the best child accessory we have ever bought. At first thought it was expensive but not at all now I've had so much use out of it.
The quality its heads and shoulders above the halfords/Adventure ones, it's slick, easy to pull. Comes with everything you need for a buggy & jogger conversion and looks pretty cool too.
It I'd big though. It does fit through doors, but the fold up size will take up the boot.
After about a week of having it we ditched both our buggies in favour of this it's all we use. Absolutely perfect for holidays too!
I've got some pics I can mail you if you want mate. Just email me.
mrhoops@me.com