Let me see if I understand this..
You have the Sony 600 with the UK firmware. What operating system? XP, Vista, Win 7, Mac... ?
You have the Sony Library and ADE installed on 3 computers.
ADE and Sony Library on all computers have the exact same log in and password.
Once you log in to the Sony Store, under "My account ->My Authorized Computers and Devices", does it list your Reader and all your computers?
I believe ADE only allows 6 devices (computers and Readers) so you should only have used 4 (if you haven't deauthorized and reauthorized anything).
Have you opened ADE on the other computers and authorized each of those computers also? (under authorize computer)
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