£5 now worth £10 instore on certain lines:

The Big Clubcard Exchange - Tesco.com

Decide how many Clubcard vouchers you would like to exchange (in multiples of £5).
For every £5 worth of Clubcard vouchers exchanged you will receive a £10 rewards token.
You can make your £5 up from a £5 Clubcard voucher or smaller amounts that add up to £5 e.g. 2 x £2 vouchers and 1 x £1. Or you can use a higher value voucher and any change will be credited back to your Clubcard account in points and carried over to your next statement.



Choose the department where you would like to spend your rewards tokens.
There are 8 to choose from.


Opticians
Toys
Pet Food & Accessories
Phones & Accessories
Baby & Toddler
Flowers, Plants & Gardening
Clothing
House, Home & DIY


for more information on the Big Clubcard Exchange go here: The Big Clubcard Exchange - Tesco.com