The UK's inward investment promotional effort combines both national and regional agencies in a co-ordinated network. This consists of staff based overseas in the principal markets from which FDI is sourced; UK Trade & Investment's HQ in London; and the English regional development agencies (RDAs) and the devolved administrations (DAs) in Scotland, Wales and Northern Ireland. UK Trade & Investment has a key role in managing this network and co-ordinating the efforts of both the public and private sector partners around the UK to make the best case for "UK plc". This ensures that potential investors have access to all the available help and advice they need to make the best commercial decisions. UK Trade & Investment's principal objectives in the area of FDI are to attract, retain and add value to UK investment.