Will the three-tier system backfire on Boris?

A three-tier system of coronavirus restrictions is set to be announced today, but the government is still locked in negotiations with local authorities over the financial support they will receive if they are placed at the highest level. With a growing number of Tory backbenchers coming out against harsher measures, could the new system backfire on the PM? Isabel Hardman speaks to Katy Balls and James Forsyth.