The 2013 Bowie exhibition is among a number of successes for Martin Roth at the V&A

The director of the Victoria and Albert Museum is expected to quit this week to return to his native Germany, after be­coming disillusioned by the prospect of an increasingly insular Britain post-Brexit.

Martin Roth, 61, who is seen as the London museum’s most successful director since Roy Strong in the 1970s, will tell staff tomorrow morning and announce it publicly when he unveils the V&A’s latest exhibition, Revolution, exploring the culture of the late 1960s and early 1970s.

Before the referendum he spoke of his concerns that a Brexit vote “could ruin everything our parents’ generation achieved — a policy of peace, reconciliation and common thought”.

How Martin Roth has made a difference to the V&A

Roth, who worked in France, the US and Germany before London, said that “in the long term, Brexit would