I definately agree with flint-wwrr on Quiet City.
- yes you would need the Cor Anglais and Piano but I it's a lovely calm piece and it would be worth it. When I heard this performed, it was by a Cornet rather than a Trumpet. Not sure which it was written for, but the cornet sound blended well with the other instruments. This could be down to individual players but may be worth considering if you have previously played Cornet?
Also as J. Lee Graham suggested, the 2nd movement of the Haydn concerto sounds like just the thing!