Audi RS4 Avant vs Vauxhall VXR8 Tourer - performance estate car showdown -

Both are high performance estate cars. Both cost around £50,000. But can the big-hearted, rear-drive Vauxhall VXR8 Tourer possibly compete with the superbly-finished Audi RS4 Avant? Steve Sutcliffe tries them back-to-back to see which is best.