Whenever you break out the Thermos to enjoy a hot or cold picnic drink spare a thought for Scots scientist Sir James Dewar who invented the vacuum flask.
For those who grew up from the 1950s onwards most memories of a family picnic involve a tartan rug, glass lemonade bottles and a vacuum flask filled with milky tea or coffee.
Indeed the tartan thermos flask of those halcyon days became so ubiquitous that for generations of picnickers, Sunday drivers and long-distance train or bus passengers it was an essential piece of kit no serious traveller would ever leave home without.
Today, those early flasks have evolved in a range of ways to create an industry projected to grow from almost £4billion pounds in 2021 to around £6billion a year by the end of the decade.
However despite the vacuum flask being an every day item we take for granted few people ever think about the origins of these magic-like, cylindrical containers which keep our favourite beverages hot or cold for hours on end.