Bought a good book called 'The Irish DADGAD guitar book' by Sarah McQuaid published by Ossian isbn 0 946005 93 1 - good for anyone who wants an overview, relevant chord shapes and some good tab tunes to try out. There is a section at the start that goes right from the basics which can be skipped by most but I thought it was helpful (I don't have anything whatsoever to do with the author or publisher!) so I'm letting you know.