Policy ‘R & D’, capacity and advocacy in English Combined Authorities

City regions and Mayoral Combined Authorities are at the heart of the devolution policy agenda in England. This article assesses and compares the policy and research capabilities of Combined Authorities in England, drawing on elite interviews with officials in four diverse Combined Authorities and their wider sub-regional policy and research communities. There are significant inequalities between the policy and research capabilities of the Combined Authorities reflecting institutional histories, as well as differences in size and functional responsibilities. Those with already greater capabilities and infrastructure appear likely to continue to benefit from greater opportunities in the future, widening existing inequalities.