And the same for my earlier new jets post

Sir Humphrey: "Very well, if you walked into a nuclear missile showroom you would buy Trident - it's lovely, it's elegant, it's beautiful. It is quite simply the best. And Britain should have the best. In the world of the nuclear missile it is the Saville Row suit, the Rolls Royce Corniche, the Château Lafitte 1945. It is the nuclear missile Harrods would sell you. What more can I say?"
Jim Hacker: "Only that it costs £15 billion and we don't need it."
Sir Humphrey: "Well, you can say that about anything at Harrods."

And some more classics

1. Sir Humphrey: "Prime Minister, I must protest in the strongest possible terms my profound opposition to a newly instituted practice which imposes severe and intolerable restrictions upon the ingress and egress of senior members of the hierarchy and which will, in all probability, should the current deplorable innovation be perpetuated, precipitate a constriction of the channels of communication, and culminate in a condition of organisational atrophy and administrative paralysis which will render effectively impossible the coherent and co-ordinated discharge of the functions of government within Her Majesty's United Kingdom of Great Britain and Northern Ireland."
   Jim Hacker: "You mean you've lost your key?
2. Jim Hacker: "Bernard, I want you to put Dorothy back into her old office."
   Bernard Woolley: "You mean, carry her there?"
3. Jim Hacker: "People can wait in the lobby or in the state room."
   Sir Humphrey: "Some people. But some people must wait where other people cannot see the people who are waiting. And people who arrive before other people, must wait where they cannot see other people who arrive after them being admitted before them. And people who come in from outside must wait where they cannot see the people from inside coming in to tell you what the people from outside are going to see you about. And people who arrive when you are with people that are not suppose to know you have seen, must wait somewhere until the people you are not suppose to have seen, have seen you.
   Jim Hacker: "Sounds like an entire Whitehall farce going on."
4. Sir Frank Gordon: "Ah, when I say not overstretched, I was of course talking in a sense of total cumulative loading taken globally, rather than in respect of certain individual and essentially anomalous responsibilities that, logically speaking, are not consonant or harmonious with the broad spectrum of intermeshing and inseparable function, and could indeed be said to place an excessive and supererogative burden on the office, where considered in relation to the comparatively exiguous advantages of their overall centralisation."
   Jim Hacker: "You could do part of Humphrey's job!"
5. Jim Hacker: "Why did you allow Sir Humphrey to come in here when I explicitly told you not to?"
   Bernard Woolley: "Well, I couldn't stop him."
   Jim Hacker: "Why not?"
   Bernard Woolley: "He's bigger than me."

As there's some more...here they are

1. Jim Hacker: "I'm happy to tell you that you've been cleared of spying."
   Sir Humphrey: "How?"
   Jim Hacker: "Something Sir John Halstead wrote."
   Sir Humphrey: "Oh, that is very gratifying."
   Jim Hacker: "Yes indeed, I knew you would be pleased."
   Sir Humphrey: "May one see the document?"
   Jim Hacker: "One certainly may. Better still, one can have it read to one: 
   May 28 - Another session with that prize goof Appleby. Fooled him completely."
   Sir Humphrey: "Yes I see, well thank you, Prime Minister."
   Jim Hacker: "No, no, no, goes on Humphrey, clears you even more. 
   Never asked any of the difficult questions. Didn't seem to have read the MI5 file..."
   Sir Humphrey: "Yes that is quite clear, thank you very much."
   Jim Hacker: "...So much wool in his head, it is child's play to pull it over his eyes. Isn't that wonderful! You must be a very happy man."
2. Sir Humphrey: "Arnold, are you suggesting that I should have the Prime Minister crawling all over Salisbury Plain, with a mine detector in one hand and a packet of Winalot in the other?"
   Sir Arnold: "It would probably do Britain less harm than anything else he is likely to be doing."
3. Jim Hacker: "Yes Humphrey, there is something I want to talk to you about. Something very secret. Uhm......."
   Sir Humphrey: "Would it be easier if I wasn't here?"
4. Jim Hacker: "You sure you watched the whole of the news?"
   Annie Hacker: "Yes."
   Jim Hacker: "Wasn't it on, the bit about me?"
   Annie Hacker: "No, unless I missed it of course."
   Jim Hacker: "But you said you watched the whole of the news."
   Annie Hacker: "Yes, but you know how it is when one watches TV: one sort of mentally tunes out the boring bits."
5. Sir Arnold: "But once they have accepted the principle that senior civil servants could be removed for incompetence, that would be the thin end of the wedge. We could loose dozens of our chaps, hundreds perhaps."
   Sir Humphrey: "Thousands..."