We just signed up with www.voipblast.com. (rates are in euros, so in sterling maybe a fraction less) Calls to Phil land line or mobile 5 cents a minute + 3.9c connection fee; SMS 3 cents (thus a 20 minute call £1 or 33 SMS £1 ) SMS 3 cents.
There are also all the usual free calls as with other voip suppliers.
