Google is a good tool for info. Search "heat resistant paint site:.uk" will get you a list of ...well heat resitant paints. After that you'll have to do due dilligence and sort the sales splurb from fact.
Presumably you can get Rustoleum paints over there? Here in Aus we can get High Heat Primer Spray... good for 1093C and a variety of colours. Well not such a variety but the usual suspects of black, silver, blue(ish) and one or two others.