A wide range of regulations apply to the UK letter service. Full details can be ied from local customer service centres (see the telephone directory for details). A booklet (available from post offices) details those regulations relating to prohibited and restricted goods (see Bibliography) and also lists Customer Service Centres. Guidance on pathological specimens is probably of most interest to the practitioner. That and a few of the other notes in the following pages are reproduced with the kind permission of the Royal Mail.