Sold at 149,500 GBP including Buyers Premium, which seems to be about 27% of the Hammer Price. I did some searching on the Bonhams site but could not find any useful info on seller's commission.
From comments made by those who have used Bonhams, it appears to be negotiable to around 10% if you have a very desirable machine, such as a Black Lightning.
This doesn't leave a whole lot for the seller. By my calculations the seller might see a cheque of about 100,000 gbp or a bit less.
It's a lot of money but a far cry from the 929,000 US figure for the Jack Ehret Lightning in 2018.
Glen