FlaminNora not all carrycots designed to fit onto travel systems are suitable for overnight use, it depends on the mattress and how they are ventilated, some are, you need to check with with brand.
Faith I have a 2011 Polo and two Quinnys: the Buzz and Zapp. I recommend both, for different things, the Buzz is perfect for a newborn and does fit in my boot with the carrycot, you just have to take the front wheel off which takes about 20 seconds. The Zapp is a very lightweight stroller which folds up tiny but is only suitable from 6 monthsn.
To those buying travel systems for the first time it is worth considering that most people (well people I know anyway!) seem to use them for a relatively short peroid of time then get a stroller/MacClaren.
Mama19080 hope you are baby boy are continuing to get on OK, Alexander is such a lovely name, so strong. I am very impressed your DD gave him such a mature and thoughtful name! If my DD got to name no2 I suspect it would either be 'bubbles' or 'daddy' but she is 19 months 
Night shift going OK here, unfortunately DH is on a course tomorrow and worked today so was up with DD this morning and will have her all day tomorrow. No sleep for me! DH usually has mondays off so she doesn't go to Nursery. Luckily I have never needed much sleep.