Honestly don’t bother. I have Loungekey and have used N Lounges from the same providers when flying easyjet. Generally now they want the extra £5 to reserve and I have never paid it as they are dreadful places. Coffee comes from a1970s Motorway Services style brown liquid dispenser. The school dinner slop is dried out. Not enough staff to clean up the mess people leave behind. alcohol is not my thing but the soft drinks machine dispenses into a mini glass that you need to fill up three times to get a normal size drink….you get the picture.

Just go to Pret - at least there is a quality threashold.

BA Lounges in S Terminal are a haven compared to the paid versions.