Pipers from the Epping Forest Pipe band entertained travellers at terminal 5 at Heathrow airport today while soldiers helped push the total collected today closer to the target on one million pounds.
More top news
Mayor of London Sadiq Khan is backing the scheme.
A spokesperson said the lightning strikes had left the "aircraft fuelling system unavailable."
Nearly 1,000 properties have been left without power, and road users have been warned of potentially hazardous conditions.