Here is the announcement:
Due to system malfunctions there is severe disruption to the carriage of hold baggage at London Heathrow Terminal 4, this includes flight with Air Malta, BA, Qantas, Kenya Airlines, KLM, Sri Lankan Airlines.
BA has made the following announcement:
The following passengers flying from London Heathrow Terminal 4 on Wednesday 20 February:
Should not bring luggage to be checked in.
Long haul passengers in the following cabins
· World Traveller (economy)
· World Traveller Plus (premier economy)
As well as all transfer passengers
Passengers who do bring baggage to be checked in will not be able to travel
The following passengers are not affected
· Passengers in Club World, First and those holding BA Silver & Gold cards.
· Transfer passengers flying from Terminals 1, 2, or 3