This film covered the whole of the Queen's 1954 Commonwealth tour in colour. The Malta section is just over 5 mins and includes some great shots of the Mediterranean Fleet escorting Britannia into Malta. The complete film does not seem to be on Youtube in one hit but the Malta shots are HERE - wind forward to 6:40.
Search Youtube for other parts, try Royal Tour 1954 and also The Flight of the White Heron.