The rise in interest rates in the U.S. will not affect the stock. It is interest rates in Britain that you have to be concerned about, and in this case it looks as if the next move will be down.So that will help the stock.
On the question of the U.S. dollar versus the pound, I think that it may rise for a while (a short term rally in the U.S. dollar is taking place) but then fall again. There is no doubt that if the U.S. dollar rises it will adversely affect the stock. No one really knows what will happen to the U.S. dollar (it depends on sentiment around the world).