Will compulsory microchipping help cut stray dogs?

Every dog owner in England will have to microchip their animal from 2016 under plans intended to cut a rise in strays.

Government figures reveal that more than 100,000 dogs are dumped or lost each year, at a cost of £57m to the taxpayer and welfare charities.

Nearly 7,000 were put down, the majority because their owners could not be traced.

Newsnight's Stephen Smith went to Battersea to look at whether microchipping could solve the problem.