ASCOT, England, June 17 : British charities will lose out on almost half a million pounds in donations from Royal Ascot this year after bookmakers ended support for a major charity race initiative as the gaming sector adjusts to higher taxes and stricter oversight.  Since 2021, gambling companies including Betfair and Ladbrokes have donated profits from Thursday's Britannia Stakes to charity, an initiative which has raised over £3.6 million ($4.8 million) for the likes of Prostate Cancer UK and