You should seek out recordings of the Polish ex-patriot composer, Sir Andrez Panufnik. He defected to Gt.Britain in the mid-50's. He passed away in the 90's.
It's hard to describe his music but I'll try by saying he is a modernist with warm but dramatic feelings. His third symphony "Symphonia Sacra" is his most famous composition. There is an excellent recording of it on the Nonesuch label. If it's not in print, it'll still be rather easy to find.
I think he wrote 10 symphonies. Also, many chamber pieces.
Check him out! He is in the same league as Pendereski, Lutoslowski, Gorecki, and others.