I have seen a good few around Dunecht, just standing in the midle of certain fields. I am presuming they are after frogs or newts in marshy areas? Although I have heard they are partial to snakes too...so maybe its Grass snakes they are after?
Duddingston Loch in Edinburgh is absolutaly mobbed by Herons this year. They look so comical trying to land in the trees when the tree is already full of them. The fishing for smaller fish has drastically fallen on the loch over the last few years, but I think thats more down to the cormarants that are there. You often get squabbles breaking out between them and the Herons.