Direct 2 Mum are currently doing an offer for the Cosatto Giggle 2 Travel System at £402 including the free car seat worth £125. This is the same as the Mothercare offer at £470.
This is the system that won gold at the mother and baby awards 2016 and includes the stroller, pram and car seat as well as other accessories. Note it doesn't include the car seat base.
On top of that you can get -10% off with code D2MQ310 bringing the price down to £362. You can also get 5.5% quidco, mine tracked within one hour, but it tracked at £16 which is £346, saving £124 on the Mothercare "special offer" right now. Shipped within an hour of ordering too.
Free standard delivery, +£2.50 for next day delivery
Other colours are available but a little bit more expensive, +£20-50 more.