Once IE8 loads for the first time, does it continue to be slow, or is it just that initial loading?
My IE8 takes yonks to load - but I do have a busy iGoogle homepage. But once it's loaded it's OK.
Have you tried it in "compatability mode" with your BBC homepage? See if that makes a difference. 1Gb of RAM might be an issue too. I have heard that the code for IE8 is quite bloated and this could sap your RAM.
Have you tried Google's browser, Chrome? It was released just before IE8 which has all the functionality of Chrome. (I wonder who copied who?!!). It's a great deal faster than IE8, both when initially loading and afterwards.
You can download Chrome from
here.
Hope this helps.