It seems to me that you are making an awful lot of assumptions....
First of all that the UK is a strong economy, in reality it is not that far ahead of Italy, so I would not be at all surprised if it gets hit with some downgrades in the coming months. There is one big difference, unlike Italy, it will not have the might of the German economy behind it if this does happen...
Despite all that has been said, the Euro is still a strong currency and the currency of our biggest trading area, so tracking the Euro would be far more important than the Pound.
In a small open economy, like Ireland, devaluations have not proven to be much of an answer, while a few economists have advocated it, it is not the general consensus. Our exports are doing well and in general are not price sensitive, so claim that a devaluation would be the answer is questionable.
You should also remember that back in late summer may people move to the Franc on the basis that it was the safe place to be, only to see up to 20% of their savings disappear when the SNB decided to peg the Franc to the Euro!
Then of course there is the possibility the it will not happen, the Pound continues to decline or the Euro rises or both and you could loose again!
Jim2007