What different power concepts and theory would you refer to if you were writing about this speech?

I have look at a speech done by Gorden Brown when he became prime minster of Britain and come up with some ideas to answer the question above:

• A speech is an example on influential power as the language devices used gains power for the speaker as it can be influential over the audience to be on the speakers side and agree with what they are saying.
• Using the personal pronoun of "I" would be important to use on a speech as it gives a sense that the speech is directly coming from the person speaking to the audience and making it clear that they have this power and will use it wisely. "I want the best of chances for everyone"
• There is also a collective pronoun used of "we" and that brings the audience into the speech and makes them feel like they can get involved in what the speaker is saying. "that if we can fulfil the potential"
• Both use of pronouns support the theory that Fairclough represented of Synthetic Personalisation that they are used to make the audince feel there is a relatioship between them and the speaker when they don't even know each other making the auidnce gain trust for the speaker and the speaker gaining power over the audience.
• Modal verbs like "will" and "can" are important as they give a sense of certainty on what the speaker is saying and that they can and will change try and change the future for the best of the audience. "I will be strong in purpose". It it makes the points they make very strong and forceful so therefore seem believable.  
• Repetition of words or phrases like "Change in our NHS, change in our schools, change with affordable housing". This helps to emphasis the point that the speaker is trying to make that they can see the things that need improving and they can help to do something about it.