To big an Island

[bobbin]

Even there, it seemed a little bit too much didn't it? (Personal opinion) :)

Not really, the population of Britain is estimated to be somewhere around 2-4 million people by 150BC, if you include Ireland, which historically has had about half the population of Britain you get a total of 3-6 million.
Compare this with the population of Roman Italy (everything south of the Po Valley) at the start of the 2nd Punic War (218BC) which was around 4 million.

My point being that the British Isle were not some sparsely populated backwater as most people think, 8 provinces is perfectly justifiable.