I was getting a bit of water in the boot after a wash on one side, most likely culprit was the gasket on the driver's side rear light cluster. Ordered one from Honda and fitted yesterday evening.
Picture of old gasket:
![Image](https://i.imgur.com/3OscKDk.jpg)
So I cleaned my car this evening in preparation for Go Japan at Brands Hatch on Sunday, and......no water in the boot, so it did the trick
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