Which constructor was present at the Redex Trophy race?
{'header': ['Race Name', 'Circuit', 'Date', 'Winning driver', 'Constructor', 'Report'], 'page_title': '1954 Formula One season', 'section_title': 'Non-Championship race results', 'caption': 'Non-Championship race results', 'rows': [['IV Gran Premio di Siracusa', 'Syracuse', '11 April', 'Nino Farina', 'Ferrari', 'Report'], ['XV Pau Grand Prix', 'Pau', '19 April', 'Jean Behra', 'Gordini', 'Report'], ['VI Lavant Cup', 'Goodwood', '19 April', 'Reg Parnell', 'Ferrari', 'Report'], ['III Grand Prix de Bordeaux', 'Bordeaux', '9 May', 'José Froilán González', 'Ferrari', 'Report'], ['IV BRDC International Trophy', 'Silverstone', '15 May', 'José Froilán González', 'Ferrari', 'Report'], ['VII Gran Premio di Bari', 'Bari', '22 May', 'José Froilán González', 'Ferrari', 'Report'], ['II Curtis Trophy', 'Snetterton', '5 June', 'Roy Salvadori', 'Maserati', 'Report'], ['XIII Gran Premio di Roma', 'Castelfusano', '6 June', 'Onofre Marimón', 'Maserati', 'Report'], ['XXIV Grand Prix des Frontières', 'Chimay', '6 June', 'B Bira', 'Maserati', 'Report'], ['I Cornwall MRC Formula 1 Race', 'Davidstow', '7 June', 'John Riseley-Prichard', 'Connaught - Francis', 'Report'], ['I BARC Formula 1 Race', 'Goodwood', '7 June', 'Reg Parnell', 'Ferrari', 'Report'], ['II Crystal Palace Trophy', 'Crystal Palace', '19 June', 'Reg Parnell', 'Ferrari', 'Report'], ['IV Grand Prix de Rouen-les-Essarts', 'Rouen', '11 July', 'Maurice Trintignant', 'Ferrari', 'Report'], ['III Grand Prix de Caen', 'Caen', '25 July', 'Maurice Trintignant', 'Ferrari', 'Report'], ['I August Cup', 'Crystal Palace', '2 August', 'Reg Parnell', 'Ferrari', 'Report'], ['II Cornwall MRC Formula 1 Race', 'Davidstow', '2 August', 'John Coombs', 'Lotus - Connaught', 'Report'], ['I International Gold Cup', 'Oulton Park', '7 August', 'Stirling Moss', 'Maserati', 'Report'], ['RedeX Trophy', 'Snetterton', '14 August', 'Reg Parnell', 'Ferrari', 'Report'], ['XXIII Circuito di Pescara', 'Pescara', '15 August', 'Luigi Musso', 'Maserati', 'Report'], ['V Sachsenring-Rennen', 'Sachsenring', '15 August', 'Paul Thiel', 'EMW', 'Report'], ['III Joe Fry Memorial Trophy', 'Castle Combe', '28 August', 'Horace Gould', 'Cooper - Bristol', 'Report'], ['V Circuit de Cadours', 'Cadours', '12 September', 'Jean Behra', 'Gordini', 'Report'], ['I Grosser Preis von Berlin', 'AVUS', '19 September', 'Karl Kling', 'Mercedes', 'Report'], ['VII Goodwood Trophy', 'Goodwood', '25 September', 'Stirling Moss', 'Maserati', 'Report']]}