I can see what you are trying say, but where do you see yourself in two years time is regularish question, so you need an answer for it that does not cast you in a bad light.

Six I never heard of in the UK, the letter, not thanking your interviewers. Sounds like a good idea that might not go down well.

Any thoughts from UK based interviewers ?

7 would have been when they say Have you any questions. Have some !
Company culture is always a good one for techie jobs, and it gets any non technical people on the panel involved.