Miles was signed for BRM for 1971, Lou and Jean Stanley recruiting him at the Dorchester, a precursor to the signing of Niki Lauda, (as seen in the doco/drama film, 'Rush') with Lou making a phone call to Bourne to receive the apparent reply that yet another 20 hp was being produced by the BRM V12 on the dyno. He was employed mainly as a test driver and raced in two non-championship rounds at Brands Hatch and Hockenheim in the BRM and also won the British sports car championship that year in 2-litre sports cars – in a Chevron B19 he beat a competitive field, including Chris Craft and Wilson Fittipaldi.