B737-500 f/o
Ya there must have been some sort of local agreement between ATC and the local GA fleet. In Cork we normally file the plan with ATC for any flight staying inside 25NM. Outside this we have to fill in the flight plan form and fax it to Shannon AIS.
I think they have been doing you a favour in the past. Maybe you should check out the following site which will show you how to file a plan.
Irish Aviation Authority - Air Traffic Services & Technology
And just so you know that you are loved, here are some encouraging words from your boss.
I don't give a ****e if nobody likes me. I am not a cloud bunny, I am not an aerosexual. I don't like aeroplanes. I never wanted to be a pilot like those other platoons of goons who populate the air industry.
Michael O'Leary
2005.
All the best, On the beach