Instrument lights only working on left side

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First night drive in the car after the m.o.t and I've noticed that the whole right hand side of the clocks are not lighting up. I took out the binnacle and swapped a few bulbs from one side to the other to eliminate multiple bulb failures and the bulbs are fine. All the instruments are working as they should, license plate lights are lit up as I've read these are on the same fuse. Any ideas what else to check?

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Quick update..... I have swapped the clocks with another set and the new ones light up. Has to be an issue with the clocks themselves. I'll dismantle them and have a look for anything obvious