Battery manufacturer Varta is teaming up with Wales Rally GB (running from December 4-7) to provide all 4,500 event marshals with a Varta Dynamo Light wind-up torch - a green link-up which the company says will save over 36,000 batteries from going to landfill. The company says the hardy, waterproof torches are an ideal solution for the event’s volunteer marshals - as many of the races take place in the Welsh forests.

To celebrate this deal, Varta is giving away 25 Dynamo Lights to readers. The torches, which have a rrp of £9.99, only need to be wound up for one minute to provide 30 minutes of light.

Dynamo Light is part of a range of eco-friendly products recently launched by Varta which includes a USB charger, 15 minute charger and LED pen light.