Retail sales data has given a boost to retailers such as B&Q owner Kingfisher, clothes retailers Next and Marks & Spencer and the supermarkets Sainsbury's and Tesco.Sales in March rose at their fastest rate in almost four years thanks to the earlier timing of Easter this year, new figures from the British Retail Consortium show. Total retail sales rose 6.6% against only 0.6% growth in March 2009. On a like-for-like basis, sales rose 4.4% from last year when sales had dropped 1.2%.Miners are struggling though amid weak commodity prices.South African platinum group Lonmin, Indian copper miner Vedanta and Antofagasta, which mines for the red metal in South America, are among the heaviest fallers.FTSE 100 - RisersKingfisher (KGF) 240.00p +3.23%Man Group (EMG) 272.40p +2.75%Diageo (DGE) 1,162.00p +1.93%Legal & General Group (LGEN) 92.75p +1.59%Next (NXT) 2,335.00p +1.39%Tesco (TSCO) 447.00p +0.97%Marks & Spencer Group (MKS) 378.90p +0.82%Sainsbury (J) (SBRY) 349.40p +0.81%Carnival (CCL) 2,672.00p +0.75%BT Group (BT.A) 124.00p +0.73%FTSE 100 - FallersAggreko (AGK) 1,195.00p -2.45%Lonmin (LMI) 2,065.00p -2.27%Vedanta Resources (VED) 2,850.00p -2.23%Antofagasta (ANTO) 1,022.00p -2.20%Kazakhmys (KAZ) 1,544.00p -2.09%Fresnillo (FRES) 849.50p -2.02%Xstrata (XTA) 1,257.00p -1.95%Eurasian Natural Resources (ENRC) 1,198.00p -1.88%Cable & Wireless Worldwide (CW.) 91.30p -1.83%Rio Tinto (RIO) 3,878.00p -1.57%