Hi I bought an SVR last year and it came with some low quality tyres. They also seem to be the wrong size when searching online. They should be 285/40/23 but the ones it came with are 285/35/23. The drive is pretty poor. I have had full tracking and suspension service done and have been told only the tyres are causing me the problems I am facing and the tracking / alignment is 100% now.
The problem being the car pulling to one side or just general slipping in the rain etc.

I have attached the car and tyres. I will be replacing with Pirellis. But what size should I get?

 

On my 2019 RR full the tires are 21" I am betting those tires and rims are after market. They have no sidewall to speak of. They look great but there is your problem.

 

To be exact....Mine are 275/45/21.
I have had the low profile tires on other vehicles and the ride suffers badly.
Good Luck..