A bit different from what I've done before, as firstly it's arguably too recent to be looking back nostalgically, plus it's the age of digital, multichannel TV, plus I don't have monthly Top 20s (and even if I did they'd be full of soaps anyway and pretty repetitive so, courtesy of DWM, here's the Top 20 programmes of 2005, with the average annual viewing figures. This does not include one-off programmes, however - to qualify, there must have been a minimum of 3 episodes broadcast.
1) Coronation Street - 11.09m
2) EastEnders - 10.19m
3) I'm A Celebrity - 9.32m
4) The X Factor - 8.73m
5) Doc Martin - 8.69m
6) Emmerdale - 8.63m
7) Heartbeat - 8.61m
8) Midsomer Murders - 8.57m
9) The Royal - 8.38m
10) Strictly Come Dancing - 8.32m
11) Dalziel and Pascoe - 8.15m
12) Doctor Who - 8.08m
13) Ant & Dec's Gameshow Marathon - 8.04m
14) Little Britain - 7.98m
15) Casualty - 7.79m
16) Ant & Dec's Saturday Night Takeaway - 7.54m
17) Wire in the Blood - 7.53m
18) Life Begins - 7.38m
19) Waking The Dead - 7.30m
20) The Two Ronnies Sketchbook - 7.04m
