For those who prefer a clean shave, Amazon is currently offering an XXL value pack of Gillette razors with 12 blade refills for less than the current Boots price of £24 and Gillette's own £18.99.

It turns out that razor design is rocket science, after all. Or, at least that's how it seems from the dozens of patents Gillette has filed on its Mach3 line of triple-blade razors. The newest model, ...