You should feel free to contact the office by telephone, letter, fax or email.
Given Matthew’s lecturing (and other) activities, you will understand that he can be away from the office for up to three days a week. However, in his absence, during normal business hours his PA Cheryl Gould is usually available to respond to your enquiries and will be happy to help you in so far as she can. And Matthew regularly reviews incoming emails (except when away on holiday) and replies as appropriate.
An answer phone service operates when the office is unattended and either Matthew Hutton or Cheryl Gould will endeavour to get back to you as soon as possible.