427. Use of patented inventions for services of the Crown.

Notwithstanding anything in the Patents Act 1977, any government department and any person authorised in writing by a government department may do any of the following acts in the United Kingdom in relation to a patented invention1 for the services of the Crown2, without the consent of the proprietor of the patent3:


    (1)     where the invention is a product:


      (a)     make, use, import or keep the product, or sell or offer to sell it where to do so would be incidental or ancillary to making, using, importing or keeping it4; or


      (b)     in any event, sell or offer to