Firstly hello to everyone! I am a new trader and am stuck on one particular aspect. Following the rule of only risking two percent of my equity which is £1k I understand that is £20 but I don’t understand what the lot size should be to equate to that value.
Hi and welcome on board 
basically this value depending on your trading strategy. Visit this lesson from BP, it should help you. Also, good solution will be checking the education section Regards Greg