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Don't confuse the law regarding legally acceptable levels of blood alcohol with the terms and conditions of a contract of employment, especially regarding employee conduct whilst on duty/in uniform/otherwise representing the company.
Whilst this particular scenario is unlikely to be specifically included in that contract, there are many clauses of a wide-ranging and non-specific nature which can be used to encompass it. After all, I'm sure it is legally acceptable to call your boss many varied and interesting names, seasoned liberally with expletives, but I doubt it would be terribly beneficial to your continued employment.
There are many, many ways a wily and devious manager can attempt to nobble an employee if they so wish, with many different actions which can be construed as 'misconduct' or gross misconduct. And as most contracts in the UK work on the basis of 'reasonable belief', it can be difficult to prove oneself innocent of any percieved wrongdoing.
That said, an equally wily and devious employee can run rings around their manager.
