Grimshaw was left counting the cost of covid and its impact on its key aviation business last year as the firm said monthly income had nosedived a third since the pandemic took hold last spring.

The architect was already facing a major headache before covid struck last March when a Court of Appeal decision a month earlier ruled the UK government’s airports policy, which included expanding Heathrow where it has been masterplanner, breached the 2016 Paris climate agreement.

…