Unless I'm missing something, I'm in the 'what's the point' camp on this one. I've only been to the Sofitel a couple of times, so not sure exactly where the "Espa Lounge" is. But can't imagine you are going to save any time, given that you have to pass the check-in and bag drop desks in T5 to get to security! Especially if Gold or First and using the First Wing. I hope it's Sofitel that's wasting money on this rather than BA!