I would not try it personally as I have seen a few of their fully formulated oil products perform poorly in tests and in real use (gear oil in particular). Like starting viscosity not as listed on the bottle on a motor oil test, along with quick shearing in use. However, I have used their steering fluid additive in a last ditch effort to avoid repair on the power steering of an old beater car and it worked exactly as advertised. I did not want to spend any more money or time on this car.
When I see how much money they dump into racing, I often wonder how many racers actually use Lucas products and I wonder why they don't spend more on R&D and the quality of their products. Maybe I am way off here, but that is my experience. I have never tried that particular oil though.
Castrol Synthetic RS 10w50 is what the shops carry around here for aircooled Triumphs. I also did not like that one. Has decent numbers but it sure shears down to a thinner grade in short order in my experience with my air cooled and shared sump Speedmaster.