A for Andromeda had a very different premise from Contact; can't speak about Hercules, never read it.
Andromeda is not benevolent, and there's a body count. Pretty scary at the time. Not long after came Dr Who, for kids, and another scary TV serial called the Big Pull, which ends really, really badly and which scared me (I was a kid at the time). The Beeb was on a succesful SF kick at the time, in the wake of the success of the Quatermass series. The Big pull was never in novel form, so far as I know. And there are no copies of the programme surviving either.
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