I didn't see a nickleharper being played in the last programme but may have missed it or been watching a different programme on the i-player.

If you are interested in nickleharpers, try the website and contacts for "Michael Sanders Design". I've seen the Northumbrian Pipes he's made for himself and his first nickleharper – and he's a talented musician and regular session player so he knows the instruments from both the design and the player's viewpoint.

On the other hand, if you're referring to the thing like a hybrid coffin/hammer dulcimer/bowed psaltery – I haven't a clue even what it was!