An ambulance services trust or ambulance trust is an organisation which provide ambulance services within the National Health Services of England and Wales. There are currently 11 ambulance services trusts in England and Wales. Ambulance services in Scotland are run by the Scottish Ambulance Service and in Northern Ireland by the Northern Ireland Ambulance Service Health and Social Care Trust. The National Ambulance Resilience Unit, which provides support to all the ambulance trusts, was established in summer 2011 and is based in Oldbury, West Midlands.