> all that you need is a 26 key anglo, you do not need 30 keys, most cg 26 button anglos, have the c# that is necesary to play in d.,this enables you to play most irish tunes

I did say "What you need depends on what you want to do." Playing Irish music in D on a C-G anglo is one of many things that the OP MIGHT want to do.

I use all my 40 keys, though some of them obviously a lot more than others. I can just about manage one key away from the basic ones - A or C on a G-D box - but I need to work out how to play such tunes. As mentioned I use the extras mainly as alternatives.