Hi
I am in the same situation. As sab124 has already mentioned, (I believe) we should not worry about this.
The explanation on the form is confusing; however the immigration law mentions it more clearly.
Although we have got our last Tier 1 extension between 31st March 2009 and 06th April 2010, the rules applied were the rules that were in place before 31st March. You might remember we even then filled a separate section as we had had our first leave with different rules.
According to law: [
http://www.ukba.homeoffice.gov.uk/polic ... appendixa/]
13. An applicant will be awarded no points for a Bachelor's degree if:
(a) his last grant of entry clearance was as a Tier 1 (General) Migrant under the rules in place between 31 March 2009 and 5 April 2010, or
(b)
(i) he has had leave to remain as a Tier 1 (General) Migrant under the rules in place between 31 March 2009 and 5 April 2010, and
(ii) his previous entry clearance, leave to enter or leave to remain before that leave was not as a Highly skilled Migrant, as a Writer, Composer or artist, as a self-employed lawyer, or as a Tier 1 (General) Migrant.
(a) is not relevant to you as it says "entry clearance" whereas your last extension was a "leave to remain" and your "entry clearance" must be way before than 31 March 2009.
(b) (i) As mentioned above our last extension was granted under the rules valid before 31 March 2009, although the application was after that day
(ii) Even if I am wrong in what I said about point (i), this point (ii) says "previous leave to remain was
not a Tier 1/HSMP". However, yours (also mine) is.
Point (i) and (ii) are conjugated with the word "and" which means we are out of (b) as well.
The above is my interpretation and hope it's not wishful thinking.
Cheers...