Can someone suggest a lab in Europe for processing E6 sheet film, specifically 5x7?

I have begun shooting large format this year, and have processed my own B&W sheets with great success. However, I also want to do color, and I have exposed a few sheets of Provia 100F. Unfortunately, there is only one lab in my country (Finland) that processes color sheet film, and they are very unresponsive and seemingly unable to come up with a price for processing my 5x7 sheets. (For 4x5, they have a pricelist...) So I'm looking to take my business elsewhere - any suggestions?