PuTTY using key-pair authentication
Configure PuTTY
Open putty, name the new session here London admin and add host/IP to connect london.remote.access.com then press save.
Optionally enter Auto-login username, example admin in Connection > Data section.
Choose private key used for authentication. Go to Category Connection > Auth and press Browse. Full content of the file can be stored in the company Password Safe in notes. Copy all notes into text editor and saving with PPK extension will re create the needed file.
Save session by going to Category: Session and press Save.
Connect
Open PuTTY, press load London admin, you should not be asked for username
Enter 'Passphrase for key' that is password used to code the private-key. It was chosen at the time of key-pair creation. After then you will be logged in without prompt for the username password.