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J. C. Bach and the Early Piano in London

A study of Johann Christian Bach's keyboard music prompts the obvious and important question: which of his sonatas and concertos were composed for harpsichord, and which for the piano? (Indeed, did he think of them as two distinct instruments at all?) And what sort of pianos did he have available on the occasions when he played them in public? Did he really play his ‘Solo on the Piano Forte’ at the Thatched House on 2 June 1768 (in a concert that consisted mainly of orchestral music) on a little Zumpe square, or was he already using a prototype English grand? When were these various models of piano first made in London, and what musical use did other composers and performers, as well as J. C. Bach, make of them?