Credit jitters and increased levels of risk aversion continued to push the dollar higher, with the euro dropping to a seven-week low against the US currency and the pound hitting its lowest level in four months. The dollar has benefited from the usual year-end window dressing, where investors have sought to cut back their short dollar positions. Analysts believe, however, that the currency's move higher over recent weeks could mark the start of a trend that will continue into next year as the earlier confidence that the sub-prime crisis would be confined to the US is increasingly undermined. Yesterday the Federal Reserve injected 20 bln usd into the financial system in order to shore up liquidity and is set to do the same again today. A similar move by the Bank of England and a massive injection by the European Central Bank came earlier this week. The moves have cheered markets and interbank lending rates have come down significantly, but concerns remain over just how much further the sub-prime crisis has to run as disclosures of large write-downs continue. Meanwhile, the pound remained under pressure, hitting a four-month low against the dollar of 1.9861 usd. The currency gained a very brief boost from news that UK annual third quarter GDP growth was revised up to to 3.3 pct from 3.2 pct previously, but it soon turned lower as investors digested a raft of grim news suggesting that the UK is suffering a similar twin deficit problem to the US. Figures showed the UK posted a huge current account deficit in the third quarter of 20 bln stg or 5.7 pct of GDP, the UK's biggest ever, with upward revisions to previous quarters' deficits on top. Public finances figures were no better, with public sector net borrowing soaring to 11.2 bln stg in November, the biggest ever monthly deficit.