I read a great article not long ago from the Toronto Star about parking structures. You might be interested:
https://www.thestar.com/news/gta/2017/08...rking-garages-out-of-sight-micallef.html
London's urban intensification is coming in the 21st century and we can really benefit with lessons learned by other cities in the 20th century.
We need to focus on more underground parking and better transit vs garages and surface lots. The BRT and bike lanes downtown mean more street parking will be eaten up and we should think about replacing a good portion of those lost space in underground lots in new developments.
I dunno why but I've always wanted to have a large, multi-story underground parking facility below Victoria Park. Entrances to the facility would be at each corner of the park + near the Band-shell. Access would be where Clarence ends near Richmond & Centennial / City Hall. The park would need to be closed for a year or so to facilitate this construction but it would go a long way to boost capacity.