Louise Evans from business advisors Grant Thornton says promotion could be worth up to £150m for the club and will have knock-on benefits for the city and Wales.
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Cloudy at first, with outbreaks of rain gradually easing during the morning.
A grey and damp start today. Rain will turn heavy and persistent late afternoon and winds will increase overnight.
Andrew walks the hills of Flintshire & Hannah visits a new saltmarsh on the Gower Peninsula, and a link to our Gallery of Wales.