Pollsters Ipsos-Mori have the Green Party on 10% (Total Weighted) against the Lib Dems on 8% and UKIP on 12%:
Lib Dem: 8%
Despite their tables providing a total weighted position, on their webpage they only report "certain to vote" and that shows the Greens on 8%, neck and neck again with the Lib Dems. Either way, Ipsos-Mori don't bother to include the Green percentage in their analysis despite it being a steady and significant increase.
Onward and upward!