Pass the brufen Lloydie .....
I'll score you some Industial Strength on my next visit to Superdrug.
Not too sure about stretching hamstrings, I would have thought having a word with Gizmo would be a good idea before you try this.
I recall the problems Michael Owen had with his - and he has access to the best medical/physio stuff going. As I recall he started doing big-time weight training on his legs, in the gym every day.
hope you are R.I.C.E.ing that knee for 48 hours as per medical advice? Last you said to me on Thurs was "I'll put a cold can of lager on it then"
mobilise it gently after this is my advice. Also in future get warmed up properly and get a good stretching regime going, practice it as much as you can, every day.
Bottom line is that you are getting older my man - welcome to my world - Muuhhahahahhahaa
lloydie