Hi Julian,
You could have Morton Neuromas (http://www.foothealthfacts.org/footankleinfo/mortons-neuroma.htm).
Worth geting checked out by a Podiatrist, I had the same problem and got custom orthotics which fixed the problem. When I run anything over about 4 miles my toes go numb and was in pain.
Hope this helps
I too have suffered the pins and needles problem - left foot exactly 30 mins into a run. I also have lower back problems on my left side. But I have found stretching the achilles (I think that's what its called - the bit that runs from your calf down to your heel) before I run has really, really helped. I sit on a chair and circle my ankles both ways for a few mins and then if I think they may still be a bit tight do a few calf raises on the stairs - works really well for me.
Hope this is of help.
