Julie Walters keeps on track as she travels the UK by rail.

Ms Walters is an agreeable companion in this four-part series in which she travels on some of Britain’s most picturesque coastal railways, stopping along the way to meet the locals.

In this first episode, the actress is in the Highlands, where she rides on The Jacobite steam train, which is better known to Harry Potter fans as the Hogwarts Express – something she never got the chance to do in her role as Ron Weasley’s mother.

There’s lots of cheeky humour along the way, as Julie tries her hand at smoking herrings and applying tick spray to cattle.

‘Has Michael Portillo been on this train?’ she wonders at one point. ‘I just thought I could
smell Lynx…’