The largest oil refinery in the UK at Fawley, Southampton, owned by US oil giant ExxonMobil, was hit by a one-day strike last Friday by around 100 workers. The Unite union members are directly employed by three sub-contractors, Trant Engineering Ltd, Veolia Services and Alstrad Services.
https://www.wsws.org/en/articles/2022/04/12/exxo-a12.html