Britain's FTSE knocked back by RBS, Ukraine
* FTSE 100 falls 0.8 pct
* RBS leads financials lower
* Russia jet report spooks markets
* Capita among companies to report good results
* WPP hit on margin concerns
By Joshua Franklin
LONDON, Feb 27 (Reuters) - Britain's top share index was on track for its biggest daily drop in a month on Thursday, led lower by a sharp sell-off in Royal Bank of Scotland and increasing tension over Ukraine that has spooked global markets.
The FTSE 100 fell 56.54 points, or 0.8 percent to 6,742.61 points at 1131 GMT, having been steady earlier in the session.
Royal Bank of Scotland led the fallers, down 9.4 percent after its new chief executive outlined plans for a large-scale overhaul after the mostly state-owned lender reported an 8.2 billion pound ($13.64 billion) loss. Continuación...