More about Top Gear

it seems that  Charles will be in the first ep : BBC2 : 8:00pm Sunday 30 June 

and

According to an overview provided by BBC America, episode one will feature Clarkson and May racing a car against a state-of-the-art America’s Cup yacht, and Hammond testing out three new hatchbacks: the Renaultsport Clio 200, Peugeot 208 GTI and Ford Fiesta ST. Sunday’s show will also include stars like actor Warwick Davis, Game of Thrones star Charles Dance and R&B singer Joss Stone.

or :

and a host of stars including Warwick Davis, Charles Dance and Joss Stone assemble at the test track to welcome a new Reasonably Priced Car.