Real-life friends and awards-season rivals Eddie Redmayne and Benedict Cumberbatch are going head-to-head at the British Academy Film Awards on Sunday, an event that aims to rival the Oscars for glamour. The British stars are both best-actor nominees for playing real-life scientific heroes. Redmayne stars as cosmos-probing physicist Stephen Hawking in “The Theory of Everything,” and Cumberbatch plays code-cracking mathematician Alan Turing in “The Imitation Game.”