Globalisation should not be unreservedly welcomed. It allows merchants to run roughshod over governments by playing one against the other. Labour and thus jobs can easily be moved to where the public are paid less that nothing thus undercutting the more developed countries that has citizens who, quite rightly, expect a decent standard of living and thus pay. Money just flows away instead of investing in the country where it was accumulated. These merchants were constrained more, for the better, when there were more regulations; and trade was mainly export/import. The merchants then had a home country they felt more loyal to.
The problem is that we think of the London Stock Exchange as an institution of the United Kingdom; but it is in private hands, so it is just another thing we value but which is simply sold off to the higher, usually foreign, bidder. If a nation values something as being important to it then it should ensure it is owned by the people, and thus will continue to act in the people's interest. Otherwise you get takeovers, er oh sorry, mergers of equals, such as this of the very things you wished to retain independent and British.