The town hall shouldn't have any say in the matter...
It needs an ITV inspection then its down to the Hacienda tax office and DGT Trafficos.
If you must sell it as is, try the small ads in Sur in English.
Don't try to sell it however if the MOT / Irish or UK road tax is out of date...DVLA or the Irish equivalent will come down on you like a ton of bricks.
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