I have the blue po ti swiss.
I know its got a few minor issues to gen, ignoring the movement.
Mine does need a service as rotor is a bit sticky so doesn't wind so well.
But i think swiss version even if dirty and needing a service, is best. With a swiss you have better ease of service and spares.
Re UK rep servicing. Don't know of any that are left. But there is a guy in Madrid whi was superb on my IWC top gun.