I’ve used the No 1 lounge a couple of times when flying U2 and FR. I get free entry from my bank and it was the first independent lounge I have used. I was impressed; a reasonable selection of food and drinks served from a bar. Staff friendly and helpful. Both times it was fairly empty with a range of seating options and a view. Reviews suggest it can get very busy, and if the customers are off on a jolly, boisterous!
You would pay for champagne but the prosecco was fine and, notwithstanding the possible incursion of hen groups, dry.