Grey book?

[wildpikey]

I've done a lot of research and cannot find an answer I'm happy with.

What is a Grey book? what does it mean? and what are the implications? restrictions? on having a grey book on bike.

Anyone got the true and actual answer for me?

No opinions ple

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[johngooding]

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[rich1968]

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[thaicbr]

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[rich1968]

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