Hi Burtie.. I found your thread interesting so i hope you dont mind me replying
firstly... you said the physios and chiros you have seen have said its a ligament strain? This is impossible as you cannot strain a ligament.
Did you actually go over on your ankle whist running? If it is a SPRAIN! Then as such time as passed i would definately advise having a treatment called Myo Fascial Release done to the surrounding tissues and get yourself on a wobble board or 1 leg balancing - close your eyes to enhance the proprioreceptor strength.
also, when ever you head upstairs, a good thing to do is go up just using your toes - let the heel drop lower then push up onto the next stair.
You can also try some cross fibre frictions yourself to encorage blood and heat into the area to stimulate the healing process. To do this, use your fore and middle finger together and rigoursly rub length ways acoss the lateral ligaments (directly below the lateral maleoli) which is the sticky outy ankle bone. Do this for about 5mins per day.
Lastly, i would get on a bike or rower for the interim period as they are non impact exercises and will keep your legs and heart strong!
Ankle problems are only problems when not looked after properly! I was the physio for the Manchester Phoneix Ice Hockey Team and dealt with alot of ankle injuries!! Hope this helps!!
Stu