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ahhh wonderful pendantry. Drinking and driving a car technically isn't illegal either. Section 30, RTA 1988 however *does *make it an offence to cycle whilst unfit through drink or drugs. The offence is not "out of control" as you describe; it is "not capable of having proper control", a subtle and very subjective difference that could well see you commiting a criminal offence if you have a few shandies and cycle home.

How can the police prove that you've had a few shandies?

And if they could prove - you have - then what's the legal limit?