Well in my Scotland campaign I was very lucky. However it still pretty much follows the general tactics of the game.

Took York before the English got hold of it. Then sent my diplomat and spy down to nottingham. Diplomat got an alliance with the english to keep them off my back for a bit. Plan was to go for wales, ireland and inverness whilst maintaining the alliance. The spy picked out a full stack english army just sitting south west of nottingham and led by a captain. With this in mind I put my main army on the border in case they tried anything.

They did try something, they completely unexpectedly decided to turn rebel. This was my chance. The english on seeing this then used the rest of their armies to wipe the rebels out but this left them severely weakened. At which point I marched my main army across the border, broke my alliance and attacked nottingham after grabbing several units of mercenaries to pad the army out a bit. Took that, marched on London (ignoring the pope's demand to stop fighting), and took that as well. Britain was now mine.

Once that was done I followed the standard city/castle configuration I like to have on the British isles which is all settlements as cities except Nottingham. This allows me to build up a fat pile of cash to upgrade settlements easily and then build up a decent army of feudal knights, noble swordsmen, pikemen and noble highland archers for taking on the european powers.

I don't tend to like using mercenaries but, as the scots have a poor missile selection crossbowmen are necessary. Otherwise I use the noble swordsmen and pikemen as holding troops whilst outflanking the opposition with my feudal knights and highland nobles.

Currently am taking on denmark on the continent having grabbed rennes and caen off the english. Am taking real advantage of the lack of garrisoning to launch naval raids into danish territory by sacking their cities, selling off all the buildings in them and then running off again. Is netting me some big money and economically damaging the danes all being well. Once they're softened up I'll then take northern europe to complete my short campaign.

Intend to go as the Scots again on a long campaign as they're a great faction to play although I have the feeling that it won't be quite so easy to get rid of the English next time around!