After a successful hotel booking I tried to amend my linked email address but now find I am completely locked out of my Rewards account using both the App and the website. Trying both the old and new email address or my Rewards card no gives the same result. Like the previous review uninstall/reinstall makes no difference. Currently on v4.8.0. Particularly galling is the lack of response by developers. If a zero star could be given.... One pissed-off customer!