Hi Simon. To be clear:
The original Right hand bulb (A) works in both the Left and Right bulb holders.
You've tried 5 bulbs in the Left bulb holder, and none work.
The fact bulb A works on both sides implies both bulb holders are OK. It also sounds like you've only tried the new bulbs on the Left side?
Next step I'd take is to try each of the 5 new bulbs in the Right bulb holder. If none work then it just could be you have 5 duds.
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