I actually managed to go flying on Sunday and attempted a Perth - Oban flight. Perth was clear and Oban reported CAVOK, so I went for it.
At Crianlarich (about halfway), there was a bank of low cloud, with a base around 2500'. Only problem was, the highest mountain around there was 3700'+. I was flying up the valleys to find a way through, but drew the line once I couldn't see the end of the valley. Discretion got the better part of valour and I turned around (not being IMC rated) - the risk of encountering
cumulus granitus was, in my opinion, too high (even with GPS). The option of going VFR on top would have been very handy
Some idea of the scenery is attached, which is fairly striking!
Scottish Winter Flying 1
Scottish Winter Flying 2
Scottish Winter Flying 3
Scottish Winter Flying 4
Scottish Winter Flying 5