There are many cars available for purchase in the United Kingdom that offer seven seats. A sensible Hyundai Santa Fe. The wallet-friendly Dacia Jogger. Premium German-ness in the (large) shapes of an Audi Q7 or BMW X7, or the Big Daddy of them all, the LWB Range Rover.
Alternatively, if you’re swimming in disposable income, you can purchase a fully electric, bespoke and breathtakingly gorgeous Rolls-Royce Phantom V built by electro-modders Lunaz. An unlikely cross-shop, admittedly, but yeesh, look at the thing.