Hard to tell from just 1 pic, but again I think Lotus 23c. The give away for me is the front bonnet is tapered up where it meets the lower side panel and the back fender bulge drops down at an angle and not smooth radius.
It also looks like a typical 60's Lotus frame
Wheels are definitely American Racing/Shelby Libre
and not Revolutions
A lot of these were (and still are) raced in the US and most with right hand drive. There were a lot of replicas made and a few still today, so parts are available if you look around.
I could be way off but this is just my opinion. Lots of the smaller 60's race and kit cars had very similar designs. Hope this helps and hope it brings you loads of fun.
In the interest of everyone seeing everything, please look at the new pictures that are posted on the main Hagerty Community thread about this car, here: https://community.hagerty.com/t5/motorsports-professional/mystery-sports-racer/m-p/92420