Help with flr(m) form finance questions

Thanks @KFdancer

Also when getting together 6 letters of correspondence, will the below be ok? We lost some letters with house move.
(spouse arrived December 2012, applying to extend Aug 2015)

1) April 2013 - Spouse Mobile Bill
2) May 2013 - Applicant job centre plus

3) June 2013 - Both names council tax

4) Oct 2013 -  Both names - Utility bill

5) Jan 2014 -  Applicant - bank statement
6) Jan 2014 - Spouse - bank statement

7 ) May 2014 - moved house Tenancy Agreement on both names
8 ) June 2014 - Both names - Utility bill

9 ) Dec - 2014 - bank statement
10 ) Dec - 2014 - bank statement

11 ) June 2015 - Applicant GP appointment letter ( there are bank statement for Jan -July 2015 with finance section also)
12 ) July 2015 - spouse bank statement
13) July 2015 - Both names - Mortgage in principle letter
Please advise...

Also can we use pension letter from our company and pay slips with address etc?

Thanks everyone for your help till now. Hopefully i can get over the line with your guidance

Anyone?

Thanks for all who did help...
Visa approved today...woohoo