I'll third that recommendation, or however far down the queue I am. Excellent service. I took a tired one over to Netley Marsh a little while back, met up, swapped it on the spot (by prior arrangement) for the same thing, freshly rebuilt, but with the correct bevel for a non-nacelle fitting which mine lacked. They had also calibrated it to suit an extra tooth on the gearbox sprocket. About £130 if I remember. Looks like new (a bit shiny for me probably!) and is dead accurate. One very happy customer.
(If I recall, one thing with a swap was it had to be 'like for like' ref the trip odometer reset spindle - ie no side-mounted version in exch for a vertical one or vice-versa. Which wasn't relevant for me - and isn't a problem anyway if you're not doing a swap.)
Next time I'm over there, I'll have another one or two in my pocket for the same treatment I hope.
Cheers, Bill