This makes the law totally rational and enforceable. The fact that evidence of age applies only at that stage does not mean that it is lawful in any circumstance to give alcohol to a person under the age of 18 in a pub at any time. We currently have a situation whereby, if one brings one's 17 year old into the pub to have crackers and soup on holiday, he or she will have to produce a card to be on the premises, which is ridiculous under such circumstances. The evidence of age card should be forgotten about before 9 p.m. The law will be rational and workable and no one will say that it is unreasonable or that it produces unfair results.