Halford do an excellent emergency bag which has jump leads, triangle, little foot pump (usless so swap it for a propper one), tyre pressure guage (again usless, get a digital one for about 3 quid), tow rope, torch and other bits and bobs - well worth investing in
Head light deflectors are required, cost about 10 quid if you get them from the AA shop at Dover port
wish I knew about the 40kmph thing and the toll booths as I was doing a constant 120 to 140 most of the time on the trunk roads with no issues /angelic