I'm sure all will be fine as long as you are in your car. That shade of metallic green looks like it will repulse anything including a nuclear attack.
The effects of a nuclear attack are actually interesting reading, along with the survival of a nuclear explosion. As long as you are more than 0.5 to 2 miles (dependent upon the yield of the device) from the epicentre and have some sort of underground shelter you have a good chance of survival. Depending upon how prepared the UK population is; 30-60% will survive. The most prevalent short term radiation is Iodine 131, which can be countered by taking iodine tablets for 14 days after an attack and the most prevalent dangerous long term are Strontium 90 and Cesium 137 which has a half life of 28 and 30 years respectively. How these are dispersed will depend upon local weather conditions, soil types etc.
The effects of a nuclear explosion are much more localised than people realise as very large bombs went out of favour in the early 1960's where it is better to have a number of separately targeted smaller bombs on an ICBM and of course START limits the number the US and Russia each have. Major population centres can expect multiple hits.
ABM technology is advancing and the UK has protection against non-ICBM missiles with Aster 10 on RN type 45 destroyers and Aster 30's will be deployed around 2020 which can shoot down ICBMs. Of course nuclear missile technology is also advancing with Russian Rs-26 Rubezh one of a new generation in development.