Thanks for the suggestions so far, folks. The mandozine site is a good resource I'd not come across, though I've had tabs from the mandolincafe site. Penny whistle books are a good idea too - and I'm a huge fan of Robin Williamson as well.
To clarify Grade 2-3, these are classical exam grades, so involve violin pieces generally in G and D and their associated minor keys, which generally hover around the first 5 positions with some little finger stretching up to 7th and 9th. The classical stuff is a necessary evil in the UK for going up the sections in orchestras, but fiddle is a lot more fun.
EDIT: that Vashon Celtic Tunes site is really good!
