By Laura McGuire All eyes will turn to Guinness maker Diageo on Tuesday, as the firm provides investors with an update on trading in the first half of the year. The FTSE 100 firm, which also makes Smirnoff vodka and Captain Morgan rum, has around £29bn wiped off its market cap value over the past year amid a slowdown in trade focussed particularly in Latin America. However, shares in the firm rallied up close to five per cent on Friday, after a better than expected financial report from fashion conglomerate LVMH reignited investors’ confidence in the luxury market – with Diageo’s ‘premiumisati…