INTERNET SERVICE provider Excite Inc has agreed a deal with the UK government to provide every schoolchild in Britain with a free E-mail address as part of Labour's NetYear programme. Excite will provide electronic postboxes for 10 million pupils and 500,000 teachers by December next and the scheme will be specially tailored to block content unsuitable for schools. Excite will recoup some or all of its costs via advertising and promises controls acceptable to parents. These will exclude violent material and ads or sponsorship for alcohol and cigarettes. David Hart of the National Association of Head Teachers welcomed the scheme but, whilst accepting the need for advertising, warned: 'There must be a clear code of practice to ensure that pupils are not exploited.'