Finally, I found a good photo of BBC's 1977 series of Eagle of the Ninth, showing Aqulia leading his troops. Details of the production can be found here. Marcus Aquila was played by Anthony Higgins. This scene, was, I think also briefly shown in Togas on TV recently, along with a couple of other scenes. Any chance of a DVD release please of the whole series, Auntie Beeb?
From a pedant's point of view, the armour looks dodgy. As it's AD 117 they'd be OK with lorica segmentata, but it looks like scale armour. And the helmets are odd too. Perhaps they are auxiliaries? Nethertheless, I'd rather have a well acted drama with naff costumes than nothing at all ...
27/7/2017 Edit: See this blog post for links to the whole series on YouTube!