Seat62K,
Who cancelled the flight Ryanair or you? How much did you pay for each sector?
Ryanair levy an adminisration charge for processing refund claims and it generally wipes out any refund amount totally! Also they will claim they are unable to refund any 'tax' charges as they are obliged to pay those to the airports concerned this is however a scam as the airports only invoice for actual passengers carried which means that Ryanair 'pocket' the tax charges for passengers who don't fly.
Would be interesting to know how you get on please update your post with news when you have it.
Good Luck.