They will move it around to get the best possible coverage of the UK.
They will not move it around to change the fringe reception because all that will happen is a different set of people will get it in continental Europe.
If they could stop all fringe reception then they would but they can't because people would just go out and buy a bigger dish.
Terry
im not saying they are trying to stop all fringe receptions its impossible firstly there is always goign to be blips in the beam, secondly as you said peopel will buy bigger dishes, yes there main focus is to make sur ethe uk gets teh signal as strog as possible, but they will try make it harder for fringe areas as much as possible, think about this way, in the minds of bbc/ses what hte less of the to evils, uk spot beam being received in quite big propotion of europe, having it receveiable in europe but only ith big dish, or give iceland more power but meaning europe has less, the centre of the beam can be moved and that what it looks liek there doing after that they will probally reduce the power down so it about 85-90 SNR i think that be equilvent of 54 RIP/DB power