Hi everyone, I have asked some questions about this before but my plans have changed somewhat. We are going to be in NYC and I am thinking about buying the ride safer safety vests for DS - almost 6 1/2 (44 pounds) dd almost 5 (42 pounds). We are then on a cruise to England where we will be in my Fathers older car (no idea if it has side impact or latch in the back, I have asked him and he doesn't know either. I am going to have to send my sister round to investigate - but I think its a 1999-2000 so probably no latch or rear SIP unless the rules were different in England.). Do you think I could use the vests (worried about SIP) or I was thinking about just buying 2 britaxs with SIP in England and leaving them there for future visits. Obviously on one hand cost is an issue, but on the other I just want the kids to be as safe as possible, and if I have to be the proud owner of a fleet of car seats that is what I will do ( I reckon if I get them all in the same colour my husband wont notice). Initially I was going to take my boulevards but I am worried about the legality of using US car seats in the UK. Thank you for your help and consideration.