We recently flew with British Airways from Singapore to Sydney on a Boeing 777-300 and experienced their Business Class Club Suites, after first visiting the British Airways Business Class Lounge in Singapore. As part of the oneworld alliance, British Airways Club Suites can be included on a oneworld Business Class fare.
After exiting the lounge there was a long line to go through another security checkpoint enter the gate area. This was due to having three gates with three departing flights and no priority line for Business Class or other priority passengers. This made the process slower, however, believe this isn't a very common occurrence.
With all B777's completed in 2022, the Business Class Club Suites began being fitted in 2019. Featuring a 1-2-1 layout, they replaced the old Club World seats which has a 2-4-2 configuration. With all seats now having direct aisle access, this solved a common complaint amongst passengers. All window seats are angled outwards toward the window while all middle seats are angles toward each other, plus each suite features a fully closing door for increased privacy. Overhead storage compartments are down both middle and window sides and are accessible easily from your seat.