I don't think you said that you served a prison sentence or not if you did anything in england over 3 months & up to 3 years carries an automatic 5 year firearms prohibition anything above 3 years you are banned for life, the only way to get the 5 year prohibition lifted is to take it to the crown courts but it can be costly if you lose,speak to your local firearms officer before you apply to see where you stand if you apply & fail you are entitled to your money back.