MOBILE CHARGER LACKS JUICE

Solar charger power bank (£13.99, amazon.co.uk) THIS sounds perfect for outdoor weekends when you never get time to plug in your phone. It’s a block about the size of an iPhone, with 20 solar-powered cells on its surface.

However, it promises far more than it delivers. It took all day to charge and then barely got my phone to 10 per cent battery in two hours.

VERDICT: This really is a last resort — when you on a long country walk or having a day out far from any power points.