Dear Tom
Ryanair's website says....
''If your flight is cancelled or before the date of travel, is rescheduled so as to depart more than three hours before or after the original departure time then you will be entitled to a travel credit or full refund of all monies paid if the alternative flight/s offered are not suitable to you and you do not travel.''
You might wish to reconsider your last post. Note ''full refund of ALL monies paid.''
I am no fan of FR and do not use them if there is another option available, but I have always found their T&Cs to be clear and unequivocal.
The FR bashing around here gets to be a bit much at times.