//Well, the customer would be being disrespectful to the owners trying to keep their business afloat with legal obligations in place.//
Well before we say that we don’t know exactly what their obligations will be. The earlier “drinks only with a meal” legislation said this (which may also help diddlydo):
"16.—(1) A person responsible for carrying on a business of a public house, bar or other business involving the sale of alcohol for consumption on the premises must cease to carry on that business, unless paragraph (2) applies.
(2) This paragraph applies if alcohol is only served for consumption on the premises as part of a table meal, and the meal is such as might be expected to be served as the main midday or main evening meal, or as a main course at either such meal."
I have a suspicion that this remark has been made by a spokesman faced with an unplanned question from the media. Yes, your drinks should only be served as part of your meal. But the headline gives the impression that you will be thrown out as soon as you put down your cutlery. As dr says above, pub and restaurant managers will use their common sense to comply with the law.