The family of a Welsh private investigator are to meet police and prosecutors to discuss the investigation into his murder. Daniel Morgan, who was from Cwmbran, was found dead in the carpark of a London pub in 1987.
Last year, the trial of several men accused of being connected to the murder collapsed. His family have called for a judge-led inquiry into the case.
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More than a thousand riders will be taking part in a series of events in and around the town.
Some warm spells of sunshine will develop, although scattered heavy and thundery showers are also expected during the afternoon.
A yellow 'be aware' warning has been issued by the Met Office for much of Wales.