The telephone number for all emergency services in the UK (Police, Ambulance, Fire Brigade and Coastguard) is 999 from a landline telephone and 112 from a mobile/cell (although 999 will also work).
The National Health Service provides free emergency care to all visitors to Britain, irrespective of their nationality.
However, should you need treatment that goes beyond emergency treatment (for example, if you are required to be admitted as an in-patient in a hospital), you may have to pay NHS charges for that treatment. We therefore strongly recommend that your travel insurance includes cover for medical expenses.
Visitors from the EU and EEA are entitled to entirely free health care from the NHS providing that they can show a European Health Insurance Card. You should therefore ensure that you obtain an EHIC card in your home country before you travel.
The UK also has reciprocal agreements in place with some other countries, including Australia, meaning that nationals of those countries are entitled to free NHS health care. We advise that you check whether your country has such an arrangement in place before you travel.