The organ is a time machine, and Thomas Trotter’s trip aboard the historic Town Hall organ today takes him back to Georgian London, where composers like Johann Pepusch and George Frederic Handel flocked from across Europe to dazzle the British public – and make a fortune in the process. And then experience the fragrant, mysterious world of the French composer Henri Mulet – plus a hint of the mighty Wurlitzer from Yorkshireman Alfred Hollins.