The Duchess of Cambridge shows how to master workwear in a heatwave in £245 L.K. Bennett dress

Getting dressed in a heatwave is tricky enough, let alone when you factor in overzealous air conditioning, a formal office dress code - and the world's attention on you. So spare a thought for The Duchess of Cambridge, who is in Luton today for a number of official engagements with Prince William. Ever the professional dresser, Kate has managed to look both cool and appropriate despite the rising mercury by rewearing a summery white flattering shift dress covered in a bright blue poppy print from her favourite high street store L.K. Bennett.

Kate first wore the high street dress, which was originally available for £245, to visit an Air Force base in Amberley on the royal tour of Australia in 2014. It was one of the most popular looks of the entire trip, as the white and blue looked eye-catching in the photographs, so perhaps it was only a matter of time before it had another outing.

LK Bennett Tamara dress

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Instead of sandals, the Duchess has smartened up the summer dress for today's event with her signature accessories - her L.K. Bennett nude pumps and a neat, small box clutch. Polished off with her signature bouncy blow dry, of course.

The royal couple are making three visits in Luton today, seeing the work at charity Youthscape in Bute Mills, unveiling a plaque at Keech Hospice and visiting an engineering company, Howard Tyler.

The Duchess' heatwave look proves that a white fitted dress with a colourful floral pattern is a winning option for a day of back-to-back meetings, when a standard navy or black dress will make it look like you're that person who has missed memo about a national heatwave.

Although the Duchess' 'Lasa' dress is now no longer available, it is a classic style for the high street brand and this season's version of the look is the 'Tamara.' The £250 white dress which falls on the knee has an almost identical silhouette, and is covered in a cornflower blue and buttercup yellow floral print.

The Duchess of Cambridge has a long-standing relationship with L.K. Bennett, which has perhaps been her biggest success story with it comes to the 'Kate Middleton effect.' Thanks to her support of their dresses, coats and her beloved nude court shoes on the global stage, the British brand has hugely benefited from her habit of making things sell out within hours and she was credited as the reason why they opened stores in the United States in 2012.