It's a good question and the answer is as you suspect that I ruled out all British shows Torchwood included when I began the site.
I wanted the site to be relevant to people watching TV now and as almost all the shows I was watching in 2007-8 were American I decided to specialise in that.
I didn't want to waste energy on shows which the majority of my audience wouldn't see.
With BBC America and streaming etc I suppose the situation is a little different now. However British shows are made in a different way and it might be simplest to just keep them apart.
Dr Who \ Torchwood aside the UK tends not to produce the big budget dramas that I like which helped make my decision.
From a practical standpoint I don't have the time to watch many more shows each week either.
So there you go. If I were to one day unleash my personal taste on the site then I could spend hours writing about British sit coms that I grew up watching and loved like Fawlty Towers, The Good Life, Only Fools and Horses, Dad's Army, One Foot in the Grave, Red Dwarf, Black Adder, Bottom, Men Behaving Badly and Coupling. But it's not likely to happen...