Just updated the Wiki to reflect AUP from MLE.
Simple A4 printouts at check-in desks in MLE state that upgrades are available from $389
MLE- MLE-LHR: WT to WTP, MLE, $389 (April 2021)
- MLE-LHR: WTP to CW, MLE, $659 (April 2021)
$659 is a great price for 11 hours in a club suite in my opinion.