Not a big Renault fan, but if we can help, just ask. Not sure about Renault Ireland now that Bill Cullen has stepped aside, but up until recently new parts were readily available.
Your local breaker will have a few for cheap parts.
Get it running check for coolant leaks after the heavy frosts and don't put to much into it until you get the first NCT failure sheet. Then, decide whether its wort the cost of fixing it. Not sure whether petrol or diesel, if petrol watch for perished fuel lines around the engine. Petrol is highly flammable, especially parked close to the house.
You will have to have it respectable looking for the test, good seat washed especially underneath, wipers, lights etc etc, oh check steel brake pipes for corrosion? If steel they might want to be treated before the test as new ones for the retest will be expensive. No rust holes in the bodywork, or fill them for the first test or you will have to weld for the retest.
Going to cost a bit for the basics, so check donedeal.ie to see what its worth going/NCT'd?
Good luck