We have it sorted. When the update arrived it came to the App first and required a new log in but my wife put in a new password without a Capital letter (Apparently required) This upset the car and it didnt recognise any password, the old one and the new one. By changing the password again in the App, to change it to include a Capital letter, it solved the problem when logging in the car. Phew!!
Thankyou to Aaron at 'Lexus Leeds' for helping us. NOTE. Updates/logins require a good Mobile signal to connect to the cars' own Sim Card. We dont have a great one at our house.