Most acrylic primers (ie leylands/johnstones acrylic primer/undercoat to be more specific) are ok to put on walls. a good key of surface with fine grit sand paper, dust down and a coat of acrylic primer will adhere to gloss surface. then after acrylic primer is dry ok to go over with emulsion of choice. hope this helps
Gloss shouldn't be used in any ceilings. only on woodwork or walls with dado rail in high traffic areas (even on walls it should be an hardwearing eggshell).
if you do use gloss on artex it will need to be undercoated with appropriate primer first.
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