I had this and it was really good. Car seat is fixed in with seatbelt but nice and sturdy. My sister also had one and she too loved it. Hers was Whinnie the pooh though. Looked really nice.
We had a Baby style Oyster system for our first two children, but it fell to bits. Have been successfully using an Outnabout little nipper since, which lies flat. We've also purchased the infant insert (£25), Maxi Cosi car seat adapters (£15 used on eBay) and a Maxi Cosi Pebble car seat (£130ish). Really like the Outnabout buggy, and have the double as well.
I’d recommend finding a pushchair/baby shop and testing a few out, seeing how small they fold, how they handle, if they will fit in your boot etc! That way you can go online and find th best deals for the perfect one! Good luck :)
Go for a 2nd hand one. We got a used Uppababy Vista for £280 and it would have been over 1k new with all the bits and we need two seats and don't want a double. Having tried loads of pushchairs with our first child we wish we'd have paid a bit more to start with. We got a Maxi Cosi car seat and pushchair when on offer and sold the pushchair so got a cheap car seat, the Isofix base was daily deals x2.
Didnt't like the Hauck we had from Aldi. Terrible wheels and non existent suspension. Poor baby was thrown about like a rag doll and my hands were still shaking an hour after using it! Went back to the iCandy (which is in 2 parts so not quite as handy but a lovely smooth ride). You do get what you pay for with pushchairs.