It is not known whether Bell – a Daily Mail journalist in the 1990s – had another job to go to. His successor will oversee a team of five and report to the head of UK representation, Reijo Kemppinen.
Bell’s successor is likely to be recruited from within the commission’s 20,000-strong pool of staff, said press officer Jennifer Hutton.
Kemppinen is currently acting in the role in addition to his other duties, but was unavailable for comment.
Among the challenges Bell faced were fighting so-called Euromyths, including claims from Euro-sceptic tabloids that officials in Brussels have tried to ban yoghurt and rocking-horses.