Thought i'd update as this may be useful....
I rested my knee for a couple of days - foam rolled and iced and but what seems to have made the difference which i have been doing this time which i didn't on the previous flare up was the 'glute strenghtening' exercises namely the 'bridge' one.....which i've been doing for the past few days atleast twice a day reps of 10.
I've managed to run 4 miles today and no knee soreness yet!!!
Keep you posted.