I've started self-massaging the legs when they get tight and sore. For each major muscle group (i.e. quads, hamstrings, calves) the procedure is:
1) Rub either side of the muscle group quite quickly with both hands as if you were rubbing your hands together. This warms up the muscles. Do this for 1 minute per area.
2) Knead the muscle, starting in the centre and working outwards, with both hands. 2 minutes per area.
3) Rub up and down the area fairly gently. 2 minutes per area.
You need some lubricant, so either massage oil or talcum powder will do. Quite often I'll just do the quads, as they seem to suffer most and luckily are the easiest accessible. It really works, especially between successive long days, so will be put into practice on LEL.