Martin,

Quick and dirty identification guide:

If it has 4 straight rows of buttons and plays the same note on both press and draw, then it's an English.

If it has buttons in a series of 2 or 3 parallel arcs and plays a different note on press and draw, then it's an anglo.

Any other combination , then it's a duet of some sort. If this is the case, post a bit more info and I'm sure it can be identified.

I have never seen a tutor which covers all systems, so you need to establish which you have before seeking advice as to the most suitable tutor book.

Good luck.

MC