verification . Please help improve this article by adding reliable references . Unsourced material may be challenged and removed. (March 2007) Cwmfelinfach OS grid reference ST185916 Principal area Caerphilly Ceremonial county Gwent Constituent country Wales Sovereign state United Kingdom Post town NEWPORT Postcode district NP11 Dialling code 01495 Police Gwent Fire South Wales Ambulance Welsh European Parliament Wales UK Parliament Islwyn