Wes Streeting (right) and the chancellor, John Healey, on board HMS Glasgow during a visit to BAE Systems Govan in Glasgow.Photograph: Jane Barlow/PA

The defence secretary, Wes Streeting, says he started stockpiling food and water weeks ago in case of a national emergency, as he talked up the threats to the UK and said his department had already begun ramping up its spending in response.

Streeting spoke after the chancellor, John Healey, said he wanted defence spending to reach 3% of GDP by 2030 and 3.5% by 2035; having already asked Whitehall departments to find 1% cuts in their budgets for long-term investment to fund defence spending.