Passengers have been advised not to travel on trains unless necessary during strikes next week.

Network Rail said about half of all rail lines will be closed when thousands of workers walk out across Britain on 21, 23 and 25 June.

The services that run will start and finish earlier, from 07:30 to 18:30.

The timetable from 20 June to 26 June is still being finalised, but the number of services is expected to be around 4,500 compared with 20,000 that would normally run.