It wasn't that Britain stuck to the rules when others didn't, it was that Britain always felt a need to gold plate the rules. Whatever the rule was, we always added bells and whistles that were completely unnecessary.
I think also people over estimate the extent that other countries ignored the rules. The German and other northern European countries were always sticklers for obeying the rules and other countries have caught up. Spain is now as bureatcratic as any EU official could want. The Italians and Greeks will always cause problems, but they are only 2 countries in 27
We had a holiday home in France for over 30 years, we visited it frequently and we saw how the French went from a very laissez-faire attitude to everything to a bureaucratic attitude.
We noticed this especially when we sold our house. The purchase was agreed on a hand shake and a few formalities - and we even made changes to the boundaries of the proeprty after the event.
The sale of the property was a rigourous legal procedure, with specialist surveys, everything having to be agreed, noted down by the notaire and two sessions, one on exchange, the other on completion, when we all met up and went through the contract of sale line by line and clause by clause. Far more rigourously, and bureaucratically than the British procedure. No deals 'under the table' that was the norm when we bught our house.