Tesco continued to slide a day after warning that it had "overestimated" its predicted first-half figures with more bad news coming in the form of the latest Kantar data, which showed another drop in the retailer's sales and market share.Shares in sector peer Sainsbury were also weaker after revealing a drop in the company's share price from 16.6% to 16.2% with a 1.8% decline in sales.United Utilities was lower ahead of its second quarter trading update, which investors will be hoping will also contain an update on its tussle with regulator Ofwat on its prices for the next five years. Trading is likely to have remained in line with management's expectations, but what the market will be looking for instead are references to the long running regulatory review from regulator Ofwat.AstraZeneca was a big faller after the US Treasury announced a stricter crackdown against "tax inversion" deals than had been expected, dampening hopes that it could be subject to another bumper takeover bid. Inversion deals are takeovers designed to reduce the amount of tax US companies pay by moving their headquarters offshore to lower tax jurisdictions.On the upside, miners were regaining some of Monday's heavy losses, but it was Carnival that led the charge after pleasing with its third quarter results. The cruise operator posted revenue of $4.9bn, up from $4.7bn a year earlier. FTSE 100 - RisersCarnival (CCL) 2,491.00p +2.22%Rio Tinto (RIO) 3,104.50p +1.50%Randgold Resources Ltd. (RRS) 4,323.00p +1.36%Glencore (GLEN) 345.70p +1.11%BHP Billiton (BLT) 1,743.50p +0.75%Fresnillo (FRES) 763.50p +0.46%Anglo American (AAL) 1,429.00p +0.18%London Stock Exchange Group (LSE) 1,899.00p +0.11%FTSE 100 - FallersSainsbury (J) (SBRY) 264.70p -5.06%AstraZeneca (AZN) 4,346.50p -5.05%Tesco (TSCO) 194.15p -4.36%Schroders (SDR) 2,372.00p -3.54%Smith & Nephew (SN.) 1,035.00p -3.09%Tullow Oil (TLW) 647.50p -3.07%Rolls-Royce Holdings (RR.) 972.50p -3.04%United Utilities Group (UU.) 816.00p -3.03%IMI (IMI) 1,285.00p -2.87%GKN (GKN) 332.30p -2.86%