A word of encouragement to all you out there thinking about, or trying to, sing to your 'tina accompaniment.I found it terribly difficult if not impossible at first, not at all like on guitar, banjo or ukelele where it seems to come quite naturally. But stick with it, it gets easier and easier and one day you find yourself hearing a neat song and just picking up the 'tina and playing and singing right along.It does help, in the beginning to know the song really well so you don't have to think about the words too much, I chose songs I'd sung unaccompanied for a long time for my first efforts.
BTW I have Dicks book but as a musical illiterate I've found it hard going but admit to not putting an awful lot of time into it so far.I forget how much I paid for it P&P to the US and there's no price in the book itself. It is pretty unique though, apart from small sections in Alistair Andersons booklet and in a tutor by an American whose name escapes me at present there is no tutor devoted to English concertina accompaniment that I know of.