Manston must have been the most extreme case. Mega wide runway from the war and approx only a quarter of its width required to make a normal runway. The illusion was to make the inset runway look very small.

01/19 Perranporth
 

No Need as it never stopped it being used when required.
Its surface was such that for it to be licenced it was not cost effective; but quite sat for use when the wind suited.