One of the more interesting things about it running so long is that they haven't had more people crop up in multiple roles without having to resort to picking people out of soap operas etc. When they have, well, it's pretty much been established no-one gives a toot, Baker appearing before his Doctor role etc.
However, spergily speaking this will be his third run in the universe with his Torchwood role as well. That might be a record
However, spergily speaking this will be his third run in the universe with his Torchwood role as well. That might be a record