Sterling has fallen to a fresh record low against the euro, while the value of the dollar has declined on talks about possible US rate cuts.
The pound touched a record low of 1.1084 euros, which made one euro worth 90.22p, before recovering slightly to 1.1196 euros.
Meanwhile, the dollar fell as analysts predicted the Federal Reserve would cut interest rates on Tuesday.
The dollar fell to $1.3662 against the euro and $1.5294 against sterling.
POUND STERLING v EURO: 15 December 2008
*All Times GMT
Sterling has now hit record lows against the euro for six trading days in a row.
"Sterling remains under pressure on continued UK economic weakness," said Geoff Kendrick at UBS.
The dollar declined on Monday on worries over the strength of the US economy, and on the uncertainty surrounding the bail-out of US carmakers.
"An interim bail-out plan for US automakers by the Bush administration is certainly weighing on the dollar, with many being sceptical as to how the industry can cope in the longer term and instead thinking that letting the market take its course would be a preferred route," said currency analyst James Hughes at CMC Markets.
The euro was supported by suggestions from European Central Bank officials that interest rates in the eurozone might not fall too much further.
Interest rates are at 2.5% in the eurozone, compared with 2% in the UK and 1% in the US.