Hi Dougie!
After doing some searching, I really don't know what to think but I'll post some pics for you to compare.
Firstly, some
in person autographs from Anne:
The autograph below was obtained in person by a member here on Fanmail.biz in June 2006:
Then, the autograph from AutographWorld:
As you can see in the above scans, the "A" in both looks the same (it reminds me of Al Pacino's autograph!). Also, she doesn't write her full name, only an "A", "H" and "y" at the end is actually visable!
Then, her first
TTM successes posted back in 2005, the below one was received in
October 2005:

The above scan's autograph is a match to the in person ones posted above, except she wrote her full name. Again, the "A" looks the exact same as in person scans, and so does the "H".
Now comparing your autograph to the above photos, the "A" differs a lot from in person scans. Also, the handwriting in the above TTM autograph (which is authentic) is
very different than yours.

Compare the "M" in "My" and the "M" in "Much love!", it is very different and I believe not done by the same person.

Below is another TTM autograph received back in April 2005:

You can compare the handwriting, but the "A" bothers me a lot - it's too different from yours. :neutral:
Anne's autographs is a difficult one, there isn't too many differences but there's enough "little" things that makes me lean towards secretarial (successes received since late 2006). I mean, the general shape of the autograph and letters seems quite similar, but I don't know...
It's up to your to decide what to believe! {thumb2} I'm between secretarial and authentic...
Good luck,
zanne