I tend to book my travel to Edinburgh about 2-3 months ahead, in blocks of 1-2 months. The last time I was making bookings was back in January. I’m planning ahead for May & June now, and I was somewhat shocked when I looked at the exchange rate. “1.38? That can’t be right…” But it was.
(The GBP:Euro rate was at about 1.45 when we moved to the Netherlands back in 2007, but it has been way below that since then.)