Given supplementals are where the LCCs make their money, I'd say ... good luck with that !
Edit:
You obviously didn't look hard enough on the EZY website !
19.9 No Refunds on Baggage Fees
Please note that Baggage fees will not be refunded once paid, even where You subsequently do not carry the Excess Weight, Hold Luggage, Sports Equipment, Musical Instrument(s) or Bicycle(s) on Your Flight or where You cancel Your Flight as described in Article 6 (Refunds and Cancellation Fees).
And yes, they do enforce it.... just search their Twatter feed for 19.9
