@ david - if you're looking for some shorter, slightly Rachmaninovian type works to get you used to the concerto format here are a few :
Charles Williams - "The Dream of Olwen"
Charles Williams (born Isaac Cozerbreit on 8 May 1893 in London, died 7 September 1978 in Findon Valley, Worthing, West Sussex, England) was a British composer and conductor, contributing music to over 50 films. While his career ran from 1934 through 1968, much of his work came to the big screen as stock music and was therefore uncredited.
Hubert Bath - "Cornish Rhapsody"
Hubert Charles Bath (6 November 1883, Barnstaple, Devon - 24 April 1945, Harefield) was a British film composer and music director, usually credited without his middle name. His credits include Tudor Rose (1936), A Yank at Oxford (1938) and Millions Like Us (1943). His son John Bath (1915-2004) was also a film composer.
Bath's composition Out of the Blue has been used as the theme music of Sports Report since the programme started in 1948. Also well-known is his Cornish Rhapsody, written for, and essential to the plot of, the 1944 film Love Story.
Richar Addinsell - "Warsaw Concerto"
This comes from the British Wartime Film "Dangerous Moonlight" and starred Anton Walbrook as a Polish Royal Air Force Fighter pilot, Composer and Pianist and was composed by Richard Addinsell. It was hugely popular at the time, but not always appreciated - Spike Millingan in his memoirs recalls that he and his ilk never referred to it as anything other than "the bloody awful Warsaw concerto".