hello
we don't have a car and have really struggled to travel w baby because of humping equipment/baby/three year old... via google i found the equipment hire co LitteStars, which was brilliant, we hired 2 carseats so our friends could drive us around when we visited last time, they were delivered by courier and picked up, very convenient.
it has made things much easier for us to trvael, so wanted to share the tip in case others were in a similar position