Son shows no interest in potty or loo. Has older sister (now 4.8 yo) who potty trained easily at 2.9 and has been daytime dry ever since, nighttime dry for last 4 months - again no issues at all).
We've tried everything - treats, stickers - he screams as soon as we ask if he wants to go to the loo. About once a week during bath time he climbs out and will have a wee on the potty but that's it.
His nursery are despairing as well and we were considering moving into the nursery at his sister's school but they refused because they only take potty trained 3 year olds.