| Keith,
do some shopping around - the EU is clamping down on European roaming charges big time (pushing for zero premium for international calls) and all of the operators have already cut their charges by up to 50%.
The Vodafone Passport option might be up your street as there is a setup charge per call but after that you get charged your UK rate. It's no good if you make lots of really short calls but the numbers might work for you if your calls are slightly longer.
You should also look into Vodafone's "Stop the Clock" option as well if your calls tend to go longer than 3 minutes.
Let me know if you need any more help.
cheers, Chi | 
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