By Laura McGuire Catering giant Compass Group has raised its profit guidance following a strong performance in the six months to the end of March. The firm,which providers catering services for universities and offices, said it would up its guidance by 15 per cent. It comes as the hospitality group reported a 18.7 per cent increase year-on-year in operating profit to $1.4bn (£1.1bn) in the half year. Revenue increased by 11.2 per cent, which the business said reflected “the strong trading performance”. Earlier this year, Compass announced plans for a multi-million pound takeover of competitor …