If I'm not mistaken you can bring it on flight but not through cargo (as checked in baggage).
If I'm not mistaken XD
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I suggest you just pay the £25. It isn't going to break you. Pack your items in your luggage along with your toiletries. Don't pack a lot.
I'm already in Ireland. Didn't pay anything extra - you're allowed a small bag on board and another below 10kg in the hold for free, but honestly they didn't even properly check. I could have easily brought both on board. I already paid £400+ just to go to the wedding, so I think £25 and anything extra is absolutely worth saving whether it would break the bank or not.