While watching the London Marathon last weekend, I recognised portions of the end of the race plus a bit over tower bridge from zwift and thought that it would be great to be able to run the entire route virtually. There’s probably about 10 or 12k already there.
I use Zwift only for cycling but if it was possible the Alpe du Zwift and the other expansions in London and Watopia I think that your expansion idea is great for all the runners that wants to replicate a famous Marathon and would be great to have another option to ride in London!