"The added credibility of Brent and of taking 30% in the local elections earlier this year means that we come under the microscope more and we have to be more professional and more strict in our entire approach as a party, " he said.
Oil producers added pressure in the market after Brent futures on Thursday recorded its lowest settlement price since December 2010 and WTI crude notched its lowest settlement since October 2011.
Brent Webb crossed three minutes after the restart, Danny McGuire added number four and, despite late tries from Simon Gris and Ben Harrison, Leeds hung on.