Adrian,
Keep in mind that I am in the USA and you buddy are in the United Kingdom.
I am an older fellow and retired so I don't drive mine much at all.
I have a whopping 2,000 Miles on mine since May 2019 when I took delivery.
In regards to issues ???
I have not had anything at all happen to mine.
I had the oil & filter changed at 500-Miles.
And I just recently took it back once it reached the next 1,000 Miles for the 1-Year-Service.
I am a car guy since back in the mid 60's when I came back to the USA after serving in Cu-Chi, Vietnam.
I've had all Models from Europe as well as the USA.
Mostly "Performance" cars.
I can tell you from personal experience the RS-3 I have which is the 2019 Year Model is Super-Car-Quick.
If Performance is of interest then my opinion is you'll totally enjoy the RS-3.
Here where I live I have checked the Mileage on occasions and at 70-75 MPH it showed 28-29 MPG with Cruise Control Activated.
That's on what we call here Shell 93-Octane which is Premium Gasoline.
That's what is recommended for it.
Terry