Royal Exchange at Harrods, Knightsbridge. Erected for the convenience of Harrods' visitors, the Royal Exchange fills many wants. here are all the facilities of postal and telegraph service, banking, theatre and ticket offices, shipping and export information, enquiry section and interpreters office. The walls are panelled in marble, and the noiseproof floor is appreciated by the visitor who takes advantage of the opportunities for letter writing which are provided without charge.