Summary: FTSE 100 opened higher on positive results for London listed companies . NatWest announced a £1 billion jump in Bretex profits . Standard Chartered reported a 20% jump in interim profits and announced a $1 billion buyback. International Airlines Group announced a half-year profit of €1.26 billion. AstraZeneca 's deal to buy Pfizer's gene therapy portfolio led to a jump in their stock. Right Moves experienced significant revenue growth. Europa Oil and Gas to take over the Clouton Gas Discovery near Scarborough . ...