https://www.citizensadvice.org.uk/cymraeg/Gwaith/dismissal/check-your-rights-if-youre-dismissed/cadarnhau-a-ydych-wedi-cael-eich-diswyddon-annheg/
Cadarnhau a ydych wedi cael eich diswyddo'n annheg - Cyngor ar Bopeth
Find out if you can claim unfair dismissal, if you've been dismissed for a fair reason, and if you've been discriminated against.