Loose screw - BMW!

When Liz and I were on our way home from Stratford Upon Avon, after last Wednesday's bike meet, I noticed that my headlamp appeared to be "strobing" the on coming traffic and road signs. Investigating it today I saw a loose screw in the bottom of the headlamp glass. This holds the lamp reflector steady when in place. To get to said screw I've had to take all of the cowlings off! What a palaver!