Insurance giant Resolution is the worst performer on the FTSE 100, after being downgraded from 'buy' to 'neutral' by UBS. The broker cuts its rating given the weak operational performance, mixed valuation picture and strong recent share price performance. The share price is left at 300p. Also lower in oil company Tullow Oil who slapped a $313.45m lawsuit on peer Heritage Oil related to the sale of Heritage's 50% interest in Blocks 1 and 3A in Uganda. The bone of contention is Heritage's refusal to reimburse Tullow in relation to a recent payment made by Tullow of $313,447,500 to the Uganda Revenue Agency (URA). Heritage believes that the claim has no basis and will vigorously and robustly defend it.Banking titans Barclays, Lloyds, HSBC and RBS are lower on the back of reignited sovereign debt concerns. Many are speculating whether Finland may be internally obstructed to approving any bail-out assistance now that the anti-EU True Finns party won a surprising 39 seats.Reckitt Benckiser is among the best performing stocks on the blue chip index as the household products group recovers from last week's sell-off.---bcFTSE 100 - RisersITV (ITV) 75.20p +1.97%Reckitt Benckiser Group (RB.) 3,231.00p +0.97%Serco Group (SRP) 560.00p +0.90%British Land Co (BLND) 573.00p +0.70%Kingfisher (KGF) 267.00p +0.60%Capita Group (CPI) 728.00p +0.41%Xstrata (XTA) 1,478.50p +0.31%BAE Systems (BA.) 334.80p +0.24%Hargreaves Lansdown (HL.) 615.50p +0.16%WPP (WPP) 722.00p +0.14%FTSE 100 - FallersResolution Ltd. (RSL) 297.60p -3.81%Smith & Nephew (SN.) 673.00p -3.37%International Consolidated Airlines Group SA (IAG) 218.80p -2.80%Barclays (BARC) 293.75p -2.62%Antofagasta (ANTO) 1,338.00p -2.48%Essar Energy (ESSR) 437.40p -2.47%Man Group (EMG) 244.50p -2.43%Investec (INVP) 464.10p -2.42%Anglo American (AAL) 3,073.50p -2.07%Severn Trent (SVT) 1,432.00p -1.98%