Leeds gets low cloud we get fog, it`s just the position of the airfield, as soon as low viz comes in a 2 runway airport loses a very large percentage of the movements, when flow control comes in places like LGW very busy single runway and LHR and MAN and to an extent BHX and LTN
can suffer.
I thought Church Fenton used to be bad for fog with being in the Vale of York
Ian