if you buy a first class Heathrow express ticket from Paddington London to heathrow then you can use the fast track / vip security section at heathrow.
i tested it in November and it worked. I was through security in less than 5 mins.
Standard class is roughly 25 quid and first class was 32. (Although could always use Elizabeth line but takes an extra 40 mins plus going through normal security).
Could be a useful alternative if pressed for time or can’t be arsed with the long waits!!