(Reuters) - UK shares were slightly lower on Friday, dragged down by Wall Street offering no respite after reeling in the red for most of the last full week of trading in 2018, as oil and related stocks weighed, while M&A in the food delivery sector boosted Just Eat.The FTSE 100 was 0.3 percent lower, while the FTSE 250 was down 0.1 percent at 0852 GMT, ahead of UK's gross domestic product announcement scheduled at 0930 GMT.The blue chips were outperforming their European peers due to their..