Hey peeps, just thought i’d share my findings for those interested.
I bought a Japanese spec car numberplate mount (£24 from Toyota - part number SU003-01539) and a 13x8 front plate.
My theory appears to have worked and now off track just driving around town and up/down the motorway my oil temps are around 74c. So an improvement of around 11c.
I’ve got a Nurburgring trip next month so i’m planning on driving there with the new square plate so its blocking airflow to the cooler and will just switch back to my UK size front plate just before going on track so that I have full cooling.
Its just two small plastic screws so takes 30seconds to switch plates.