Tesco expects to add one million new Clubcard members into the fold as a result of the £150m revamp of its loyalty card scheme.

Cardholders will be able to double the value of vouchers against a range of products in-store and online from Monday. Previously, vouchers were only worth face value on Tesco products but could be redeemed for up to four times their value with partners including restaurants and theme parks.

Shoppers have until 30 September to use vouchers in the wine/champagne and flowers/gardening sectors. There is no deadline for other categories, although in all categories shoppers have will have up to three months from the issue date to use them.

“Now with customers going to greater lengths to search out the best bargains it is even more important for Tesco to say thank you when they choose to shop with us,” marketing and commercial director Richard Brasher said.

“But from next week we want to say an even bigger thank you by allowing customers to double the value of the vouchers we send them, making shopping with Tesco even better value and even more rewarding."

Tesco staff will work through the night after stores close on Sunday to install new Clubcard desks where customers can exchange tokens for ‘double-up’ vouchers, the supermarket said. Participating product categories include clothing, baby goods, wines and mobile phone airtime.

A new TV ad campaign featuring Cold Feet actress Fay Ripley and The Full Monty star Mark Addy launches next week to promote the revamped scheme, which Tesco predicted would attract up to a million new members.

A national press, magazine and online marketing push will also be run.