For security reasons, the timing of the ceremony was kept a close secret, and Mrs Thatcher wasted no time naming the £70 million diving support vessel, watched by the men who built her.
I name this ship Stenna Seawell [cheers and applause].
But new orders are needed urgently. Otherwise 3,000 jobs could be lost here by early next year, a worrying prospect for Mrs Thatcher, whose son, Mark, has been asked to leave his apartment in Dallas, Texas, because the owners fear that he's a target for terrorists.
Prime Minister! Prime Minister!
Gentlemen of the press! Yes [break in tape].
Well, terrorism affects us all, and it affects us just as much as anyone else. And I am as worried as anyone else would be, and as many other people are, and I know that many people have already been affected by terrorism. We just have to fight it.
Later, Mrs Thatcher drove to a Scottish hotel for an annual secret meeting of the West's leading diplomats and financiers. The security was more intense than ever. Even the famous Gleneagles golf course was deserted.