Hi Pip...
The English
The Anglo
Duets...
MaCann, Crane (Triumph), Jeffries, and latterly Hayden.

I play Macann meself, but can get some sort of tune out of the others on a good day, though the Jeffries Duet does my head in!!
Number of hands.....Two, surprisingly!
Didn't mean to put "At Once" That would be silly, obviously!!
But, lets not tell Wav. He might be tempted to take it up.
Mind you, at current prices he probably couldn't afford one anyway!
Cheers Ralphie