Travellers looking for the most excellent airport tax-free shopping deals should shun Heathrow, according to a study. A mystery shopping work out involving 10 major European airports showed Heathrow offered the lowest discount.

Compared with high street prices, the tax-free discounts at Heathrow were now 3.1% better, the study for shopping comparison website Kelkoo showed.

Average saving among the 10 airports was 6.2%, with Lyon in France offering the top discounts - 11.9% better than those on the high street.

Gatwick was the 5th-best airport for discounts, with its tax-free items 5.0% lower in price than on the high street.

The survey concerned looking at the prices of 22 products, as well as food, drink, fashion and electrical items. A Panasonic FZ38 Digital Camera ranged in price from £267.85 in Heathrow to £137.58 in Lyon, and a Dolce and Gabbana shoulder bag cost £1,020 in Heathrow and £696.07 in Rome.

Heathrow and Gatwick were the most comfortable airports for luxury, fashion and electrical goods. Spanish airport stores had the maximum prices for health and beauty products, and wines and spirits were dearest in French airports.