Note that the only compulsory fields are your email address (so we have at least one way of contacting you with a reply) and the code at the bottom of the form.
If you are intending to make a purchase at some point, or want a definitive cost in this respect then you should also provide the delivery address, so that we can determine the postal charges. If you provide a phone number then we may find it easier to contact you via phone with a response. Or just call Martin Wilkie on 020 8404 0711 or mob: 07986 437904.