Have to disagree. Particularly during the summer months I much prefer the Panorama lounge due to the terrace, huge windows and fantastic airport/runway views (hence the name). The OW lounge is nicely furnished but at the end of the day still a tiny room with no natural light and grand views over... the checkin area. The catering is the same in both lounges.

However, I would only go to the Panorama if your flight is confirmed to be leaving from the E gates as they are a satellite terminal which is quite a trek (and compulsory Heidi train ride) from the other gates. As KARFA says LCY flights often leave from there but not always - in my experience the last LCY flight of the day tends to leave from D, the others from E, but it's not set in stone.