M&S chief executive Stuart Rose will signal the end of the store's flirtation with young fashion when he delivers a recovery strategy to the City on Tuesday.

Per Una Due, one of the sub-brands placed 'under evaluation' when Rose arrived last May, will be axed, joining other brands that have already been abandoned, such as the David Beckham boys' range. Abandoning teenagers means M&S will no longer compete in the under-30s market with chains such as Topshop, which is owned by arch-rival Philip Green, and Zara.