I've bought this pushchair after reading all the recommendations on here. I am very pleased with it (got the GT version) but felt the carrycot was too expensive to justify for such a short period of time.
I've Googled relentlessly for a cheaper solution but eventually settled on this.
https://www.amazon.co.uk/dp/B01E9BANI4/ref=pe385721137986871TEEitem
I'm pleased to report it looks really good, is very secure and cosy for DS but a fraction of this price. It's more of a cosytoe than a carrycot but I think provides a bit more comfort and warmth than a normal cosytoe.