No, you need to buy at least an H fare. They are reasonable to LHR around $800 incl taxes. They tend to be more restrictive to other destinations in Europe -- often 7 day stay. Search for H fares on Travelociy to get an idea for your destinations.
However, E+ is a nice perk compared to flying on NW and worth the switch.
You should be able to get a comp to Prem Exec. That would give you *A lounge access on intl flights and 100% mileage bonus.