Unless talks between Royal Mail and the CWU are successful there will be further strike action later this week. If no agreement is reached three days of strike action are planned starting on Thursday. On Thursday 43,700 staff in mail centres, delivery units in mail centres, drivers and garage staff will begin strike action at 4am. On Friday 400 workers at three sites in Plymouth, Stockport and Stoke who read and enter mail addresses will walk out. On Saturday 77,000 delivery and collection staff across the UK will strike. During strike action customers should be aware that all mail deliveries sent from the UK will be subject to delays.