If you look at the GBP exchange rate over a longer period, say 5 years, the GBP has a stable range against the Euro.
From 2004 - early 2008, the GBP was between 0.66-0.71 to the Euro.
Currently, it's around 0.86, so you need a lot more GBPs to buy the same number of Euros.
But this is not a stable position.
The market has been unsettled by concerns over the economy, of course. But also, there has been a lot of panicky speculation by foreign exchange dealers, and short traders. This has created a blip.
But if the recession is global, all economies will eventually settle back to a sustainable position, and the GBP should creep back up to nearer its old position.
I'd suggest ... don't sit on a large Euro position, and don't forward buy Euros at the current value. Hang on to your GBP. Or, if you are holding Euros, sell them forwards.