Tanks On Lawns?

Ian Blackford has announced he will stand down as leader of the SNP Westminster group, but why now, and what does this tell us about divisions within the SNP? The team discuss the news, who might take over, as well as the thorny issues in PMQs and FMQs from housing stock to a National Care Service. Are party leaders placing policy 'tanks on lawns' ahead of the next General Election, and what does it tell us about the potential future 'battlefields' of politics?