The Greater Manchester Mayor is set to speak at a conference organised by Left-leaning think-tank Compass after reasserting his belief that the asset-rich middle classes should be taxed more.

Labour's Makerfield by-election candidate bought the two-bedroom Kennington property in 2005 and since then its value has doubled to £480,000.

The Greater Manchester Mayor is set to speak at a conference organised by Left-leaning think-tank Compass after reasserting his belief that the asset-rich middle classes should be…