The same thing happened to my husband, madmart, when he retired from Lloyd’s Bank; his job in now being done in Bangalore, almost certainly by someone getting paid a lot less than he was.
Companies on the whole are concerned about their bottom line, as company bosses have their bonuses to think about, and the goodwill of their shareholders.
Thing is, the cost of living in Eastern Europe is almost certainly a lot less, so their workers, although they get paid a lot less than ours, can have a good standard of living on less. It is not the case that British workers are greedy, just that living in the U.K. is expensive.
Try telling a Turk how much we pay in council tax, and for water, electricity and food; I’ve done this, and they’ve been amazed.
I think that after Brexit, a lot of firms will be moving to Europe, not just because of wage costs, but because of tariffs and supply problems.