With the brilliant chaos of Christmas over, January should be a time to reflect, take a breather and enjoy some well-deserved me-time. There’s plenty going on this month, so there’s no excuse not to treat yourself to a day out or two.

January sales: all month

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Navigate your way through the country’s annual discount avalanche, where department stores, high street shops and boutiques will slash prices for a limited time. Keep up to date with discounts and offers at moneysavingexpert.com.

Burns Night: 25 January 2013

Celebrate the work of Scottish poet Robert Burns with our homemade Cock-a-Leekie Soup. And don’t forget to sing Auld Lang Syne!

Decorative Antiques and Textiles Fair, Winter Edition, Battersea Evolution (The Marquee), Battersea Park, London SW11: 22-27 January 2013

Hollywood glamour is back in force at the Decorative Antiques and Textiles Fair. A lavish celebration of the streamlined style of the interwar years, you’ll find waterfall chandeliers, mirrored furniture and luscious fabrics set against an Art Deco backdrop of black, white and silver.

Mario Testino: British Royal Portraits National Portrait Gallery, St Martin’s Place, London: Until 3 February 2013

Eight royal portraits shot by outstanding fashion photographer Mario Testino between 2003 and 2010 are gathered together for the first time in this gorgeous exhibition. See the official engagement portraits of the Duke and Duchess of Cambridge, a Vogue commission and Prince Charles's official Christmas card from 2004.

British Wildlife Photography Competition Exhibition, Horniman Museum, 100 London Road, London, SE23 3PQ: Until 24 February 2013

There's still time to see this free exhibition of winning images taken by amateurs and professionals from the 2011 British Wildlife Photography Competition. Explore the diversity of Britain’s natural history and learn about how to protect our unique environment.

Photography: 'Windy Day' by Steward Ellett

Marilyn Monroe: A British Love Affair, National Portrait Gallery, St Martin's Place, London, WC2H 0HE: Until 24 March 2013

Photographs and magazine covers from 1947 to 1962 capture the essence of the world’s most popular pin-up, with personal touches from the British photographers and personalities who worked with her.