Heathrow Airport is set to face severe disruption as staff announce several walkouts. The London hub has confirmed there will be strikes at the end of April and for much of May. The Unite union has warned that planes will likely be “delayed, disrupted and grounded”. The long weekend walkout is part of a slew of strikes to be held by different departments at the UK’s biggest airport over the next few weeks. Border Force officers are set to strike from 29 April to 2 MayThe Public and Commercial Services trade union (PCS), which represents Border Force officials, says more than 300 of its members…