@philbky
Less than 1% of LHR movements are A380s. Rest of the 99% have no plans to buy A380s because LHR is slot restricted. This is with LHR charging same airport fees for A320/B737 and A380.
It is not easy to fill a VLA through out the year without trashing yields. Good for airlines who want to dump capacity on others. Not so good for airlines who need to earn for living.