8mm Microbore - Zoning

I have an 8mm microbore central heating system - fully pumped. I want to add a time switch controlled zone valve to control one radiator in a room which is only used at certain times of the day. The only zone valves I can find are 22mm. Do I really have to use a 22mm to 8mm reducing arrangement, or is there an alternative, such as an 8mm valve somewhere out there, or using something other than a motorized heating valve? Solenoid valve perhaps?
Any advice much appreciated.
Regards,
JMcG
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You can get TRVs which can be electrically controlled. They aren't particularly easy to find, though. There are two types. Firstly, you get actual thermostatic valves, with a heating element wrapped around. Secondly, you get motorised versions. The motorised ones are more reliable, but more expensive. Some types can be run with a modulating signal to allow analogue control of flow. Sorry, I can't remember the make.
Christian.
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