There are motor shows, and then there is Salon Privé London. On 16 to 18 April 2026, the lawns of the Royal Hospital Chelsea will once again trade quiet symmetry for carbon fibre, polished aluminium and the faint scent of warm brakes. Ticket prices begin from around £45, rising through a range of hospitality options, but the real currency here is atmosphere. This is not an exhibition hall filled with strip lighting and tired carpet tiles. It is London in spring. Fresh cut grass underfoot. Pale sunlight catching the curve of a front…