Like so many elements in the fascinating world of wine, the concept of sweetness is often open to debate. For some connoisseurs, a wine may only be considered sweet if it falls among those categories boasting the highest levels of residual sugar, such as Tokaji and Passito wines. For others, wine is a decidedly 'dry' invention and talk of sweetness has no business here at all. As always, personal taste reigns supreme, so let's stick to the facts. We spoke to the Lukasz Kolodziejczyk, Head of Fine Wine at Cult Wines, to find out how the sweetness of wine is measured.