80 milligrams of alcohol in 100 millilitres of blood, or
35 micrograms of alcohol in 100 millilitres of breath if a breath test is used.

This can't be measured in units or drinks because people’s bodies deal with
alcohol at different rates. To be on the safe side, people who plan to drive
should not drink any alcohol.

Maximum fine £5,000 and/or up to six months' imprisonment, mandatory disqualification
for at least 12 months for first offence, at least three years for second offence within 10 years.

It is an offence to drive with more than the following amounts of alcohol in your body:

Under 5's may not be given alcohol except on medical orders

You can’t go into a bar unless it has a ‘children’s certificate’.
You can go into licensed premises where alcohol is sold but not drunk (a shop that sells alcohol, but where you can’t drink on the premises)
You can go somewhere where you can drink, but that doesn’t sell beer (like a pub beer garden)

You can go anywhere in a pub but not drink alcohol

You can be bought beer or cider to drink with a meal, but not in a bar

It’s against the law for anyone under 18 to buy alcohol in a pub, off-licence, supermarket or other outlet.
It is illegal for anyone to buy alcohol in a pub for someone under 18