Pulled the cam cover off and was glad to discover some adjustable cam wheels and Unknown cams.
Can anyone shed some light on what make they are please.

 

Pretty sure they are mazdaspeed cams if anyone comes across this topic.

 

are those modified stock cam gears, cut and threaded onto some hub?

 

It would appear so.
It's what was on the car probably from before it was imported from Japan, previous owner never mentioned any engine work, being an RS with the original seats, wheels and strutbrace missing I'd guess that they were all removed after it was shipped to the uk as happened(and still does) with lots of the imports.