The FTSE 100 has reversed earlier falls and is now trading marginally higher at 7,058.96.
Software developer Micro Focus saw its share price jump to the top of the leader board, up 7.9% at £14.11 after investment bank upgraded its stock to a "buy" recommendation.
Mining and commodity firms were the biggest fallers, led by Russian steel specialist Evraz, down 3.79% at 516.8p.
The sector was hit by concerns overslowing global economic growth and excess supply of crude oil.
The FTSE 250 is largely unchanged at 19,003.65.