I "accidentally" discovered HALF A SIXPENCE during 1979 on the late movie on NYC's Channel 5. I turned it on just before the "Half a Sixpence" number between Tommy Steele and Julia Foster. I didn't get to see it all, but years later it was shown on the Disney Channel. What a great movie! Great choreography (Gillian Lynne of CATS fame), charming actors playing the leads, and all that beautiful on-location photography in England! Tommy Steele sets the screen on fire when he lets loose in a dance number, and his star turn in the role of a simple lad who gets too rich too quickly and ends up miserable is believable and touching. Julia Foster is by turns sweet, vulnerable, AND feisty as his love interest, Ann.
The film (based on the London/Bdwy stage show and directed by movie-musical veteran George Sidney) has the look and feel of an old-fashioned MGM musical, which is probably why I loved it so. It seems to be more widely known in the UK - I believe it was more popular there than in the States at the time of its release, and perhaps it gets more TV airings in the UK? It's just too bad that it's not seen more often and appreciated as it deserves.