V-Flyer

I am booked on another Virgin flight to the States. However the part outwards from LHR-ATL will be on the Delta codeshare and therefore operated by delta. I thought those were all from same terminal (3) but I just checked the booking and apparently this flight is from terminal 4. Causing me to wonder: how will that go with using the Virgin clubhouse then? I'm thinking you can't use the clubhouse cause checkin is at terminal 4 and you can't travel to other terminals once passed security? Anyone any experience with this?

If your flight is from T4 then no, you can't use the Clubhouse.

Delta have their own lounge in T4.