There is no direct relationship between the pound and the yen. Currency has nothing to do with the GBP/JPY pair. When the pound goes up, the pound/yen currency pair goes up, and when the pound goes down, it goes down. This situation is in the case that the price of the yen fluctuates little. On the other hand, if the pound does not move, the yen will rise and fall, and the yen will rise when it falls.