The FTSE 100 gained 0.5% to 7,248.57 on Thursday morning following advances made on markets in Asia and the US overnight.
Oxford BioMedica (OXB) was top of the leader board, gaining 9% to 11.7p after it announced a major collaboration and licence agreement with Bioveratic for the development and manufacturing of lentiviral vectors to treat haemophilia.
RELX Group (REL), the global professional information and analytics company, added 1% to 1,471.7p after reporting it increased its adjusted operating profit by 6% to £2,284m in 2017.
Trifast (TRI), which produces industrial fastenings to major global assembly industries, said it is confident that it will deliver its expectations for the year ending 31 March 2018, sending the shares 1% higher to 248.5p.
Convatec Group's (CTEC) revenues rose to $1,764.6m in the year to the end of December, up 4.5% from $1,688.3m a year ago. The shares added 4% to 205.8p.
The biggest faller was Lancashire Holdings (LRE), which fell 5% to 620.5p after reporting a pre-tax loss of $72.9m in 2017 compared with a pre-tax profit of $150.4m in the prior year after suffering 'damaging' catastrophe losses impacting the US and surrounding territories.