I recently discovered this site:
UKnova, which allows to download torrents of british tv shows. This is where I've downloaded the episode of "Ancient Rome: Rise and Fall of an Empire" featuring James D'Arcy.
For those not at ease with downloading torrents, because most of the time it's illegal, well, this site works a little bit like many anime fansub groups, which means that they don't host torrents of shows that can be legally purchased. Therefore, it's not illegal, as long as you don't sell your copy, and buy the DVD once it's out (which I will definitively do with "Ancient Rome", it's such a good docudrama!).
Voilà.
Squeeing about James d'Arcy in toga? Am beyond squeeing, so it'll have to wait a little bit more, when I'm more coherent.