On this week's episode - The first big vote of 2017 is set to be for locally elected mayors. Significant power - and money - will be devolved. But is the system transparent enough to stop mistakes being made? We hear from the chair of Parliament's prestigious Public Accounts Committee, Meg Hillier, who has voiced some concerns. Shadow Home Secretary Diane Abbott is set to join the Privy Council, whilst Labour strategists are planning to boost the party’s ratings in the polls by relaunching Jeremy Corbyn as a left-wing populist in the New Year. We hear from Ms Abbott on both these issues. Nicola Sturgeon will this week present demands for a huge swathe of powers to be transferred to Holyrood following Britain’s exit from the EU. Former First Minister and SNP international spokesman Alex Salmond explains what exactly this will mean for the party and what role the SNP will play in Brexit negotiations. Riots broke out last week in HMP Birmingham prison and was described by the Prison Officers' Association as the worst since the Strangeways jail riot 26 years ago. Justice Select Committee chair, Bob Neill, explains how he has long warned of excessive pressures being placed on the prison system. And finally, for our UK politics year in review – UKIP deputy Chair, Suzanne Evans; former Shadow spokesman on Europe and Labour MP Pat McFadden and Senior Editor at the Economist Anne McElvoy. Merry Christmas!