LONDON (AFX) - UK first quarter preliminary GDP is expected to have risen a seasonally adjusted 0.4 pct from the previous quarter, and 2.6 pct year-on-year, according to the median of 19 analysts' forecasts compiled by AFX News. Fourth quarter GDP was up 0.4 pct on the quarter and 2.6 pct year-on-year. GDP data will be released on Friday.