The review will run parallel to the one being conducted as a condition of the £1.6bn emergency funding package provided by government.
Gilligan held the cycling brief during Johnson’s second term at City Hall and was responsible for leading on the design and construction of the capital’s new cycling infrastructure.
City Hall and Transport for London are exploring the feasibility of powering the entire Tube network with renewable energy by 2030.
The Mayor, Assembly Members and staff have been working from home for the past 18 weeks due to the Covid lockdown.
The move will save 55m over five years which Mayor Sadiq Khan says can be used to protect front-line services.