newcastlecycling

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The shortened Blackhill course..., with almost no place for rest and, strangely, tougher than the normal BH course

I can only speak for F Grade:

We had quite a competitive race at the Gang on Saturday, including a tight finish. 

Personally, I would have raced at BHill because I need to practice those sort of downhills for the TT  but I suspected that I would find the shortened course quite difficult without the rest before re-ascending the hills.
I am (blissfully) unaware of the reasons for the two races being held, but it suited us in F Grade to race with KOCC.