Mexico       Be alert for pickpockets and thieves, particularly in bus stations, airports and on the Mexico City Metro.       Keep your belongings with you or in a safe place.       Only use taxis from authorised taxi ranks (Sitios). Do not hail passing taxis, particularly in Mexico City.       Dress down, and avoid wearing jewellery.       Be particularly alert when withdrawing cash from cashpoints.       Check the Foreign and Commonwealth Office Travel Advice.       Carry a photocopy of your passport with you, separate from the original.       Leave a photocopy of your passport and itinerary with a contact in the UK.       Enter next of kin details into the back of your passport.       Do not reveal personal telephone numbers in UK to strangers conducting surveys.       Do not carry drugs, the penalties can be severe.       US dollar travellers' cheques and notes are more easily exchanged throughout Mexico than sterling equivalents.