I have just been involved in a trial of the Artemis Monitors, Artemis are the main UK distributors for Mindray. My understanding is that Artemis have the sole contract for Mindray Hospital monitoring. Penlon have the same monitors (just re-badged.
Artemis are based in Dartford, their servicing has been amazing, they have a dedicated Central London Rep, who was available by telephone 24/7, and was able to assist/train the staff.
We trialled the Pulse Oximeters, Their VS-800 NIBP Moitors and also some of the higher accuity monitors - They have really got a great product.
Their monitors are pretty much the same as the Philips range, but prob half the price!
In terms of service, Their guy came in and took apart the monitors, the Tech's all had a play, and put them together again.
we were given a sheet of paper with all the prices for spares/repairs.
I will deffo be asking for these monitors, and If anyone else wants their London contact for demo's/trials, Just shout!

Hope this helps guys!