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The role and influence of all-party groups

They cover everything from the dairy industry to whisky - but how influential are the many hundreds of all-party groups (APGs) that have been created at Westminster?

This month the All-Party Parliamentary Cycling Group saw the government introduce a new amendment to the Infrastructure Bill to bring in a National Cycling Strategy.

But what exactly are APGs, and how do they operate?

The Week in Parliament's Alasdair Rendall reports, and speaks to MPs Julian Huppert and Andrew Rosindell.