A steam powered car from 1907. Large enough to take the family but not as bulky as the need for a boiler and water supply would lead one to expect.
This one was made by "The White Company"

I can't find any Rolls Royce cars that ran on steam and still only three references to Charcoal but I think my theory as to what constitutes a "Charcoal-powered" car is sound.
Anyone else got any ideas?