I have decided to buy a car seat as it seems that it doesn't matter whether or not you own a car, you will probably need one regardless.
I was also advised me that it can be good for using inside the house for carrying baby room to room etc...
I would like to get a rear facing one as apparently they are much safer, but other than that I have no clue 
There are so many different types and although I know I need one for a new born, I don't know much else. One thing I was wondering is if they are sold so babies can grow into them IYSWIM. My DH and I live in central London and neither of us own a car or drive so it will be used sparingly. For this reason I dont want to spend a load of money on one every 6 months (unless that is the only option of course).
Any advice would be so appreciated 