I just noticed this ad while browsing the internet, and recognized the plate immediately.
The same LS 400 featured in Top Gear's 1990 review of Lexus was recently sold on August 3rd, 2018 for only £720.00.
The car remains mostly original, retaining most of its engine covers and miscellaneous trim pieces, but it has unfortunately had rear end damage on the left quarter panel that left a scratch and dent. The car has also had a tow hitch installed on it at some point. This LS was last up for sale by Downs Auto in Epsom, Surrey, with 159,000 km in January, and I don't believe it had the quarter panel damage then. It has been driven 5,000 km since.
Here is a mirror of the Ebay listing, with a few images:
https://picclick.co.uk/Lexus-LS400-1990-40-LITRE-RED-CLASSIC-CAR-273375368319.html
[ The scrape appears to have caused some rust. Hopefully this can be mended quickly, before it expands ]
Here is the original episode, for reference:
I do hope that whoever bought this car takes good care of it, as it is a part of Lexus history and a very early production model (4/19/1990).