The ballot for industrial action opens on Feb. 9 and closes on March 9. If a strike is voted for, industrial action could begin before the end of next month.

The 30-plus drivers are based at depots in Essex, West London and Grangemouth. The drivers undertake work as part of the Phillips 66 contract, which supplies fuel to Jet Garages, Unite said.

(Reporting by Seher Dareen and Arundhati Sarkar in Bengaluru, Editing by Louise Heavens)