The Sainsbury’s double-up event allows shoppers to swap points for a voucher which is twice the usual value.

For example, 1,000 points = £10 instead of £5, 5,000 points = £50 instead of £25 and 10,000 points = £100 instead of £50.

Customers can order vouchers online between 28 October and 3 November. Alternatively, points can be swapped via the Nectar app from 11-17 November.

The voucher can then be spent in store between 11-17 November and can be used on the following categories: electricals, entertainment, Tu clothing, homeware, Taste the Difference wine, sparkling, champagne, sherry and port, toys, seasonal, cosmetics, fragrance and skincare.

Customers must have at least 1,000 Nectar points to take part and it can’t be used for groceries online, in locals, centrals, petrol stations, concessions, Argos or Argos at Sainsbury’s.

Jimmy Galloway, loyalty marketing manager at Sainsbury’s said: “The double up event has proved to be immensely popular in the past and we know that this year more than ever our customers are looking to make their money go further and find little ways to help with the cost of Christmas.

“We are delighted to announce that it is returning again this year and are glad to help out those customers who are looking to get a head start on their shopping.”