In fairness, I don't think anyone outside the US would be aware of how big a story the Petrus dinner was in the UK. Also, I think Pelihu's opinion shows the difference culturally between the US and the UK - though the press killed them off, the whole rumour mill that they did this really caused a lot of bad blood.
British culture is to reserved. Being "showy" with money is considered incredibly tacky, and money is virtually never discussed on any level, any way, any how.
This story boils down to the fact that everyone knows people in the City make a lot of money, but the City itself tries its level best to keep this as quiet as possible - it is endemic in the firms. Sure, you may take home a lot of money, but don't rub it in people's faces especially when your money is made through transactions by other people. It is considered tantamount to saying how much you screwed a customer for at the signing of a deal - these things should be private affairs.
Sure, have your wine cellar. Have your wine in bond storage worth millions. Paying an 80% mark-up on a vintage in one of the most famous restaurants in London and being pompous about it being to celebrate how much money you made from a deal you did? Big, big no-no. It points the firm to paying the ridiculous money that the tabloid press will be over like a rash, and were. A meal and some wine would be fine, but the £20k bottle of wine was a killer on things. At lunch.
They basically broke the one of the rules the city considers important to operate successfully.
I seem to recall some of the problem was that they couldn't comprehend why it was a bad idea, and would generate bad press. I don't know how much Ramsey (the restauranteur) shot himself in the foot, or even was involved in them being named, but he is currently easily the most famous chef in the UK and worth millions.
The rumour mill has had other cases in recent years - some partner at a law firm, who tried to get his secretary to pay dry cleaning for some ketchup she spilled on his pants, ended up losing his job because of the amount of negative publicity he brought when it went round the mill (trying to get a £20k/annum assistant to clean a £1m+ year lawyers pants). There has been other events too, which - given the NYC Dry Cleaner case - would be seen in a completely different light in the US. Adapting to the local culture is critical - the job may be the same, but the way things are perceived can be entirely different in another country.