Coronavirus: Mandatory mask bylaw gains support of London city councillors London Medical Officer of Health Dr. Chris Mackie encouraged councillors to support the bylaw to further promote the use of masks to limit the spread of the novel coronavirus.“The bylaw really draws in the enforcement power of the City of London bylaw officers,” Mackie said.[ Sign up for our Health IQ newsletter for the latest coronavirus updates ]London businesses to whom Global News spoke, meanwhile, voiced their support for the bylaw.“We are happy it’s mandated because then it does not become a question for anyone who comes in,” said Karen Stewart, owner and director of Westland Gallery.Since reopening, Stewart said, they already had a mandatory masking rule in.