It’s rather unusual to find one Russian in a programme with three British composers, but Prom 16, with Jac van Steen and the BBC National Orchestra of Wales, brought together two of this season’s themes. The first in the 2013 Proms’ Tchaikovsky symphony cycle (no. 4) was presented alongside British works including one by the composer Granville Bantock, who is featuring in a total of five Proms.