MANY, MANY thanks for your words of advice M.H.
It's good to get a bit of a voice from beyond my woe!
Have been for a swim this mornin' and am now (supposedly) doing my assignment (started this post grad. course last Sept....glad that it's raining as it makes me feel better about sitting on my arse indoors).
Will I be well enough to manage a walk later....stay tuned excitement fans!?

As for the swollen leg, Huwski......ICE.
You could also try the cold bath strategy and some GENTLE quad contractions to stimulate the circulation.
Do keep us informed. Any bruising/discolouration??
The thigh is a very vascular bit (muscle tissue++) and running with some bleeding there can be problematic.