Retailer M&S gains; leads British grocery sales growth per Worldpanel data
** Shares of British fashion and food retailer Marks & Spencer MKS.L rise as much as 2.6% to 380.4p
** MKS among top FTSE 100 gainers .FTSE
** Remains UK's fastest-growing food retailer
** grocery-only sales surge 14.8% in 12 weeks to September 6 YoY - Worldpanel by Numerator
** The market researcher adds that British grocery price inflation rise to 2.3% in the four weeks to Sept. 6 from 2.1%; grocery sales climbed 2% YoY
** Other UK-listed grocers sales rise too: Ocado OCDO.L jump 13.3% YoY; Tesco TSCO.L up 1.7%; Sainsbury's SBRY.L increase 2.9%
** MKS up ~14.9% YTD