I like your piece. Please don't take this the wrong way. Your work is clearly strong enough to demonstrate the limitations of BBCSO Core. In other words, the library does not do your piece justice. Nice job.
It's actually nice. You have even automated the tempo which gives the track more spirit. Personally, I'm against spitfire because of the competition - that's why using East West 🤣🤣. If there's any negative aspects i would have to stick with, it probably would be the beginning, I believe it's a little to loud, and I would lower the volume down (just a little touch). Also the woodwinds would be more twisted in terms of volume. (bar 11 - 13) they sound a bit mechanic to me. Apart that it's a really good project. Good Job!