Here is what you can expect if the speed camera flashes
1. you drive past a camera or suspiciously parked vw transporter van.
2. you see a flash
3. about 3 days later you get a letter (well the registered owner does) telling you the location and the speed. Perhaps it was 93 on Lansivayla where the limit is 80

4. you have a week or two to reply to the letter. plead guilty/not guilty. explain your version of events and give the driver's details (if it wasn't the registered owner). You can ask for things to be dealt with at your local police station or the one in the place you were caught speeding
5. after you post that back you get another letter telling you to visit the police station you nominated in #4. You must go there in the next 2-3 weeks.
6. you visit the police station and show your driving license. they call up the picture of you driving and they print off the bill for the fine. 93 on lansivayla will get you 70e. If you disagree you can take it up with the central police station in Helsinki.
7. if you do agree with the fine, then you have 2 weeks to pay the bill.
A foreign driving license (EU) was no problem for them, they didn't even comment on it at the police station. At stage 3 the letter did have "ajokortti?" written on it, since if you have a foreign license and are also the registered owner then according to the system the registered owner does not have a driving license.