Hard Disk vs Time Machine

Today I had to install a new hard disk. Whilst installing OS X i reached the section where the installer asked if I wanted to install a backup. Clicked 'yes' then on the next screen the installer did not find my external disk. So after a number of attempts I bypassed this and later used migration assistant.
All seemed well until I went in to Mail. All of the folders are there, but no emails.
When I leave Mail open, and click on Time Machine I cannot see any of my emails.
However, if I enter TM from the icon at the top of my screen I can see the emails. But 'Restore' is greyed out.
How can I get TM to restore these files?
Is it because there is a new hard disk & TM thinks that the files belong to the old HD?
Thanks
Paul.

This is exactly my point.
This action does NOT work. The 'restore' icon is greyed out.
I have suspicions that in performing the restore some of the permissions have been altered so that my account cannot access the TM database.
Currently altering the permissions on my External HD to allow full read & write access.
Started the process at 06:45 [GMT] this morning and right now at 14:51 [GMT] the process is still underway.
Message was edited by: paulbackhouse

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