The UK Pound slid against its key rivals on a warning from ratings agency Fitch that the country faces a 'formidable' challenge in bringing its fiscal house in order. The GBP/USD pair slid from an overnight high of 1.4527 to a low of 1.4372, with most of the decline coming in about a two hour window. That put the pair back near its lows from yesterday and extends the pressure on the pair that was seen to end last week.