The FTSE 100 Index is up 16.2 points at 3906.1, taking its cue from the close of trading in the US on Friday.
Last week saw Wall Street end on a high note with the Dow Jones Industrial Average closing nearly 150 points higher on Friday night.
But with no major blue-chip updates expected ahead of the Christmas break - and with GDP data not out until later in the morning - volumes are light.
Financial stocks, which have endured a bumpy December, are stronger and adding some support.
3i is up 17p at 553.5p while Abbey National has climbed 12.5p to 518p and Bradford & Bingley has put on 6p at 289p.