As title, a good White gloss that does not yellow ?

I thought they all yellowed with exposure to UV. Its just how quickly they yellow.

Dulux has always been ok for my dad.

I find the standard B&Q gloss paints brilliant.

From memory

Dulux Trade 'Pure Brilliant white' is a brighter white than their 'white'
BUT yellows alot lot quicker.

Water based stuff stays white longer...............

as said above go for a good satin wood (water based) or ever a good egg shell paint m8