Does this apply to TfL» -Crossrail trains from Reading? I think that we mentioned this around "Freedom Day" on July 19th and I got the impression that it did. But a friend who commutes to Paddington (albeit by GWR▸ ) thought not. (He reports that "a lot of people" are not masked on the Tube.)
On Crossrail trains between Reading and Paddington yes, its a condition of travel