In reply to Dave Cundy:
> Remember that your phone has call records to support the fact that you tried to call Europcar to tell them of the delay, several times. It's their fault that they didn't respond to your calls. Sounds like it's a ploy to get a more profitable contract. I'd be looking at the Europcar Ts and Cs as to what they reasonably require you to do in the event of a delay. Ts and Cs must be fair to both parties. So there will be reasonable requirements on them to be able to receive your communications and take appropriate action.
All good advice.
Organizations seek to external cost, and on initial contact, will just if not ignore will just say no. Most big organizations are the same NHS, Police, Airlines, and in my opinion the people working within are complicit.
What the OP could do is be persistent and maximize the cost to Ryan Air by being in the small percentage who are prepared to go all the way. What's the worst that can happen, a weekend break in Dublin and the court fee, if he loses. If he wishes to fly to Dublin for the court case, Ryan air do some good deals.
Also have look on Money-saving expert forums, there are people there who live for this.