Summary: FTSE 100 rises on a day of earnings announcements , driven by Cendrica 's exceptional performance with a tenfold increase in net cash and 55% jump in adjusted profit . Shell 's $5.5 billion buyback scheme and dividend hike fail to impress investors , leading to a decline in shares. Barclays faces challenges as increasing quarterly pre-tax profits are overshadowed by mounting bad debt provisions . Drax Group 's positive half-year pre-tax earnings do not prevent a slip in shares. BT opens higher on the back of quarterly revenue rise , while Ocado 's shares are impacted by the upcoming retirement of th...