They're trade plates, similar to our Z-plates in Belgium. The black T25 had a standard british plate once, T25 GMD, but I've found nothing on plate check sites.

https://i.ytimg.com/vi/h049hLF2fVY/hq720.jpg?sqp=-oaymwEhCK4FEIIDSFryq4qpAxMIARUAAAAAGAElAADIQj0AgKJD&rs=AOn4CLBkhbCFVM3-mfr0QSKlNM9EDSq6uw

On the DVLA site the GMA is registered under the make "GORDON MURRAY AUTO", so I assume that having it listed under the "Gordon Murray Automotive" is correct, as they also seem to use that name on their site as a brand, not just as a company name.
About the Gordon Murray Design vehicles, it would be interesting to find a registration (the O56LB is not found on DVLA site) to know if they use that name or if they are also registered as Gordon Murray Automotive. They use a similar model name, but from Wikipedia I would guess that they are a separate brand/make, possibly they are older and they changed from one to the other at some point.

Good morning,
I come to you for your opinion.
I added this vehicle a few days ago:
https://www.imcdb.org/vehicle_1937767-Gordon-Murray-Automotive-T50-2023.html

The make of this vehicle is "Gordon Murray Automotive" which sells models "T.50" and "T.33".
https://en.wikipedia.org/wiki/Gordon_Murray_Automotive

Looking at the site, the brand "Gordon Murray Design" also exists.
https://www.imcdb.org/vehicles_make-Gordon+Murray+Design.html
https://en.wikipedia.org/wiki/T.25

Should the two brands be combined under the "Gordon Murray Automotive" brand or should they be kept separate?