Small piece of music in 'Hilary and Jackie'

Recently posted this in the "Comments" section, but figured I'd have better luck getting a response here on the Message Board.

Does anyone know the title of the small piece of music which the young actress portraying Jacqueline du Pre at about age 10 plays at what is apparently a regional, or perhaps a national, recital in Great Britain -- about 15 minutes into the film? As shown, Ms. du Pre just knocks their socks off (as she must have done in real life at that age - my own reaction while watching this part of the film was stunned amazement), and (somewhat to her astonishment, and to her sister's chagrin) she receives a more-than-well-deserved standing ovation at the awards ceremony immediately following.

I had thought it was from the Elgar Concerto, but can't find it there (don't mind, though, since listening to the real Ms. du Pre play that entire concerto is simply breathtaking). Thought it might be from one of the Bach pieces excerpted for the film, but it's not. Now, it may be in there (the Elgar, the Bach, one of the others), and I'm just missing it, but I sure haven't found it anywhere I've listened, and would love to obtain the original piece (what is played in the film may well be just an excerpt of a longer work).

Thought the film was great (not sure about all the "who's sleeping with whom" stuff later on, and yes, perhaps the telling of Ms. du Pre's life story - necessarily condensed - is not totally accurate; yeah, I get that), but all of the actresses portraying Hilary and Jackie over the years were great, and I'd watch Emily Watson read the Manhattan phone directory verbatim for four hours straight, she's that incredible -- if for some reason (you're a hermit, etc.) you haven't seen "Breaking the Waves," I envy you your first time watching her in that film; also check out "The Boxer," where Ms. Watson plays opposite Daniel Day-Lewis (although Brian Cox does pretty much "steal" that movie, a la Claude Rains in "Casablanca").

Thanks for any assistance anyone might have on that little bit of music from "Hilary and Jackie."