Shares in Europa Gas and Oil took a tumble on Tuesday after the company said overall production at its West Firsby oilfield in Lincolnshire has been affected by the severe winter weather.As a result of the bad weather and some operational issues the average production for the 6 months to 31 January 2011 is down to 151 barrels of oil per day, but the company said that with the WF-9 well coming onstream and the forthcoming WF-7 repairs, "production will soon be back on-track.""We expect the WF-9 well to perform in line with expectations and we will inform shareholders as soon as we know the results," pledged Paul barrett, managing director of Europa.Meanwhile, on the company's part-owned Barchiz asset in Romania, the joint venture partners are discussing what steps to take next. The option favoured by Europa is to penetrate a thicker section of the oil-bearing Oligocene sandstone and to test the main prospect target, which remains untested by the original wellbore. However, the boffins will get their heads together a determine a course of action on 25 March.