As PH-UKU mentioned watch for east or south easterlies anywhere north of Aberdeen, especially the northern isles. Fog is common, occasionally unannounced on a TAF. Often Norway offers the only alternate. But if easterlies are forecast, head out west - the Outer Hebrides get very little fog by comparison and will be stunning in easterly weather.
Aberdeen is obviously busy, but also take note that Scatsta is one of Scotland's busiest airfields during the week. But for otherwise quiet airspace and spectacular flying, the Northern and Western Isles are unbeatable.