LTA Forms differ between different pension administrators, so it is difficult to answer your question directly.
I would say that if this is the first pension you have drawn upon, and the value of the benefits you are putting into payment is less than the current Lifetime Allowance (£1,055,000), then most of the questions on the form will be not applicable. On my company's LTA form you probably wouldn't need to complete more than page 1!
The second part of your question is a little puzzling. I work in pensions administration and I am not sure what you are referring to.
Can you post the exact question it asks of you?
Haizeydays