Can anyone reccomend any good books for self tuition for piano/keyboard? I don't suppose I'll be able to do it for a while, but I think I'd like to have another go at keyboard after over 20 years' break! Even then, I never had lessons, but just used a self tutor book, (which has since long gone).

I like "Alfred's Basic Adult Piano Course" - the "all in one" version ones include theory - they all teach in a chord-based but with full bass notation style and are suitable for piano or keyboard. Also there's many other books published by Alfred in the same style.

You could try Piano Time by Oxford

I'm a big fan of Piano Time so I reccomend that too

The Fanny Waterman Piano Lesson Series
They come in three volumes
and are good value for the money.

Good luck.
xx