I'd like to rent a McLaren 570S or a Ferrari Roma for a weekend in London to see what it's like to own one.
My budget allows. What should I look for? And is it even worth renting such a car in London or is it better to go straight out of town?

Most providers in London require a car of at least 30 years of age for this level of model (sometimes 25+ with a higher deposit) and 2-5 years of driving experience. Typically, only 100 miles per day are included in the rental. Each additional mile costs between £3 and £10.
Video every millimeter of the car's body and wheels upon acceptance. In London, there's strict inspection of the condition of the wheels after parking near the curb.

If your budget allows, this experience is definitely worth trying, but pay attention to the rental terms. Reputable companies like sports care hire London are always transparent about the deposit, age restrictions, mileage limits, and mandatory insurance. It's also important to clarify any fines for exceeding the limit or minor damage. Reputable services provide a clear understanding of all the terms before booking. Many choose to pick up the car and immediately drive out of town. This is perhaps the best balance.