Hey guys - Ryanair cancellation question again.

I had a 6am flight from Edinburgh to Tallin booked with Ryanair and they cancelled it at 11pm the night before. They offered a refund or re-routing. I looked online and booked an alternative flight on Lufthansa, Edinburgh -> Frankfurt -> Tallin for the same day as the original flight. The original flight was £14 and the new flight was £250. Obviously I'd like Ryanair to pay me for the second flight instead of a refund. Do you think they will accept that and how should I pursue it?