Hi Digitalkiddie,
Whilst we all know that NAP (Name, Address and Phone Number) should be consistent in citation, if your business offers its services locally and internationally, I would include both local and international phone number on your website, then use relevant phone number from local/international citation.
I dont see this being a problem and have used this successfully in the past.
If you are worried, the alternative is to use local number consistently, and for international citations simply prefix number with [UK].
Hope this helps
Woody