I have no problem with "a bit of TV".
I do think most young children watch far more than "a bit".
It freaks me, seeing the immediate impact on my children and many other children I know, when you turn the TV on. They are all quietened, eyes glued to the screen, staring away. Most of them will stay staring for hours.
And I do notice that most houses we visit, especially in winter, the tv or computer games are turned on as the major form of entertainment. And however long we stay, that's what the children are doing, in house after house. Plus every sleepover, a dvd or similar is the main activity.
I do think that most UK children are spending a huge amount of time in front of screens (computer, tv, dvd, games consoles). far more than parents maybe realise.
And I do think it's linked to the huge rise in sedentary behaviour, childhood obesity, concentration issues, which are being documented in recent studies.