Contact Us. Please only contact stores by phone if you need stock availability update. Islington (Flagship store) 020 7354 2999. Charing Cross 020 7930 9940. Hampstead 020 7435 5479. Kensington 020 7937 6506. Soho 020 7287 8504. For all other enquiries please e-mail: Buying department, Bulk Stock orders & Educational enquiries pdqart@cassart.co.uk. If you want to help fill the town with artists! Marketing &ampl Sponsorship marketing@cassart.co.uk. Have a passion for Art? and want to join the customer service team at Cass Art - send CV to jobs@cassart.co.uk. All other product or shop enquiries info@cassart.co.uk.