LONDON (Reuters) - The British public’s expectations for average inflation over the next 12 months jumped to 3.8% in December, their highest since 2011, from 3.3% in November, a survey by YouGov for U.S. bank Citi showed on Thursday, a possible sign of concern over Brexit. Expectations for inflation over a five- to 10-year horizon remained steady at 3.4%. “Despite recent moderation, inflation expectations remain relatively high,” Citi economists wrote in a note to clients. “Brexit uncertainty has previously tended to drive inflation expectations higher. However, the latest developments seem to have only impacted short-run expectations thus far.” YouGov polled 2,040 adults on Dec. 14 and 15.