This is another paper coming out of Imperial College but not from Ferguson:

Li et al, "Substantial undocumented infection facilitates the rapid dissemination of novel coronavirus (SARS-CoV2)"

https://science.sciencemag.org/content/early/2020/03/13/science.abb3221

They use a similar Gamma for the compartmental model as Ferguson, with supplementary material here

https://science.sciencemag.org/cgi/content/full/science.abb3221/DC1