Starbucks branches have temporarily banned reusable cups in response to the coronavirus outbreak.
The coffee chain said customers would still receive a 25p discount for bringing reusable cups with them, but drinks would be served in paper cups.
Great Western Railway and LNER have banned reusable cups on trains – but GWR scrapped the policy after days.
A hygiene expert said containing the virus should be a "greater priority" than environmental concerns.
It is understood Starbucks made the decision internally, rather than on the advice of health officials.