People are saying that Greece could drag down the Euro further, however the pound is so linked to the Euro its dragging the pound down with it.
Also the Eurozone has higher interest rates than the UK so this is keeping the exchange rate low.
I predict a range of 105-120 this year.
I know the peak was about 150 to the pound, but I cant see the pound getting that strong in the next 5-10 years.
Long term trend in my opinion would be 120-130 cents to the pound.
Only my opinion and only time will tell.