Heddlu is the Welsh-language word for police and may refer to: Wales Dyfed–Powys Police (Welsh: Heddlu Dyfed Powys) Gwent Police (Welsh: Heddlu Gwent) North Wales Police (Welsh: Heddlu Gogledd Cymru) South Wales Police (Welsh: Heddlu De Cymru) United Kingdom British Transport Police (Welsh: Heddlu Trafnidiaeth Prydeinig) Civil Nuclear Constabulary (Welsh: Heddlu Sifil Niwclear), responsible for providing security at nuclear sites and during transportation of nuclear materials in the UK