In reply to JB:
Plenty around here my luver, bring the repellant! ....and they do bite.
Be sneaky, camp somewhere facing SW, or in valley running sw to ne. Look carefully and there are quite a few leats around which are well upslope, so pick up the breeze but save having to lug water around.
Worst places are east side, especially near the forest....such as Teignhead Farm....midge capital of the moor!!