Just watch that the Farnells ones may be 90 degrees out of phase from the originals, in which case you need to compensate by not aligning the dots on the gears. The "out of phase" ones seems to be more common than the ones we need.

I got my pots from https://www.ebay.co.uk/itm/171859308690
There's also 2 types, with different lifespans.. number of turns before they wear out
 

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