Take a look at their website
Call18866.co.uk for full details of the latest charges.
Connection charge is 1p/min wherever the call goes.
UK is free from then on for calls to 01 and 02.
08xx are cheaper via BT.
Overseas calls may work out cheaper depending on how long you are going to natter. Look at their sister company
Call1899.co.uk and work out the best route.
Ireland is ½p/min but 3p connection. USA, Germany and some others are 3p connection only, free from then on.
Mix and match from both is the best idea.
Happy dialling.