Its my sciatic nerve....

the tension is in my hamstring ... when i stand for too long my hamstrings just tense up to the point where i have to sit down ... i've no back pain at all

same with walking ... as i walk my hamstring starts to tense up to the point where i start to limp...eventually i have to come to a complete stand still and squat down for a few minutes...to get it to go away ...

i've only been to one session with my physio but he says it's neural tension and the nerve could possibly be trapped inside its sheath somewhere causing it to tug further down my leg ...