Hello Laurence Jones @laurencej
If you look under the rubber mountings there may be a part number etched into the base of nearside mounting block if it’s a Jaguar sport/TWR spoiler. Not very clear to see but may read SPB 1005 which was the JaguarSport part reference – these are highly desirable.
Just interested as looks like a TWR item.

Not sure of markings for early TWR versions but there were also a few aftermarket producers of similar spoilers.

Shame I bought one few months back especially as mine came without one rubber pad but it was the correct JaguarSport (SPB1005) version for my VIN 139++number so was a good buy.

Regards, Robin