The TSSA union has announced further strikes on West Midlands Trains/London and North Western Trains on 31 July and 1 August.
A reduced level of service will still run to Watford Junction and Bletchley.
EDIT- Service plans are now out on a line by line basis-
LNWR- https://www.londonnorthwesternrailway.co.uk/industrialaction
West Midlands Trains- https://www.westmidlandsrailway.co.uk/travel-information/journey-planning/service-disruption/industrial-action
Note the VERY early finish of services on the Friday as the strike starts at 12 noon.
UPDATE 29 JULY- The strikes are now suspended- a normal service will run on both days.