Honeywell 22mm motorised valve to 20mm composite pipe

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CBW

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He would have most likely used a 22mm x 20mm reducer
 
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No, he didn't. He only used 20mm pipe-compression nut + olive - 22mm valve

There are photos in this thread, though may be hard to see the motorised valve connections
https://www.diynot.com/diy/threads/...ge-to-3-4-bsp-male-cylinder-hw-outlet.557158/

Post #14
Wow, what a lash-up. A photo of the actual valve would help, but generally you'd use something like this https://www.wolseley.co.uk/product/uponor-compression-adaptor-brass-20-x-22mm/

The difficulty with zone valves is that the cap nuts don't use standard pitch threads, so you might not be able to use the nut from the adaptor.
 
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