Mamas & Papas T2

Excellent and very versatile. The main seat is HUGE and fits a 5 year old comfortably (and is still ok to push). The rear seat is on the small side but adequate for up to 18 months or so I think, possibly 2 years at a push. Second seat can be removed easily to leave an enormous basket. The back part of the basket also folds up out of the way easily to reveal a toddler step, and you can just lower it back down to put stuff in the basket, then fold back up and get your toddler back on the step. Very generous hood, nicely padded bumper bar that can be removed, or undone either side with a gate action for easy getting in and out. Handlebar brake is a little fiddly till you get the hang of it. Easy to push, swivel front wheel, all 3 wheels come off easily to make smaller folding. It also has 3 suspension settings for the rear wheels, hard medium and soft, cup holders on either side of the seat, and the front wheel locking button is conveniently on the side of the pushchair rather than down near the wheel.
Only downside to this pushchair is the size and weight when folded it's pretty big, but with the wheels off is no bigger than a large single, and again, with wheels off is not that heavy.
Comes with a hefty price tag, but they are very reasonable second hand and are usually in very good condition.