Shares in ITV rose 2.6% after the broadcaster said it had appointed EasyJet boss Carolyn McCall as its new chief executive.
ITV's previous chief executive Adam Crozier left in June, although Ms McCall will not take up the post until January next year.
ITV was the biggest riser on the FTSE 100, with the index up 41.04 points at 7,419.43 by lunchtime.
In the FTSE 250, shares in struggling engineering firm Carillion leaped 22%.
Carillion announced on Monday that it had appointed EY to support its strategic review, which has been launched after it issued a profit warning last week and announced the departure of its chief executive.
The company was also boosted by the news that it is part of a consortium that has won two lots of work for the HS2 rail project.
Carillion's shares were trading at about 69p, although this is still well below the 191p price they stood at prior to last week's profit warning.
Staying in the FTSE 250, shares in Weir Group rose 9% after the company - which makes pipes and valves for the energy and mining sectors - said revenue and operating profit for the full-year were set to beat expectations.
Weir said it been helped by a faster than expected recovery in the North American oil and gas markets.