Strangely or spookily I was reading about the Borgie last night. John Ashley-Cooper was not very complimentry about it. He prefered the near neighbour, the Naver, I can see his point of view.
I take it you have seen http://www.riverborgie.co.uk/
There are few pike in Northern Scotland, probabvly due to the icemelt from the last ice age. The theory being that the pike coming from the southern rivers did not have a link the way the ice melted, the pike that are there have been introduced. IMHO the game fish more than make up for the lack of pike.
Prey for rain.