Apologies for the late reply from me also, been working away from home this week.
The driver in the link kezo posted will be suitable, we have a static caravan and we’re here now, I’ve taken some pictures, just connect the 240Vac feed to the input and the fairy lights to the output, be aware that the output is dc, on standard fairy lights it should not matter which way + or – that they are connected as kezo points out, however if the lights are LED they will have to be connected in the correct polarity, LEDs will only permit current in one direction, so after connecting it if the fairy lights don’t work then switch the output wires around and the fairy lights should work.
Below is a picture of the driver, 240Vac in 24Vdc out.
Daughters motability car Hyundai Tucson Ultimate self charging hybrid Serenity White Moss Grey interior.
My car SEAT Ibiza SE Tec 1.2 petrol TSI 2017.