By Sruthi Shankar (Reuters) -Britain’s FTSE 100 ended higher on Friday and marked their third straight weekly gain on strength in commodity-linked shares and consumer staples, although worries about high inflation slowing economic growth kept sentiment in check. After falling as much as 0.35%, the blue-chip FTSE 100 rose 0.2%, led by energy stocks and large dollar earning companies, including spirits maker Diageo and British American Tobacco. The mood took a hit as data showed Britons cut back on their shopping in February and consumer confidence levels tumbled this month, while accelerating i…