SET(M) premium application Aug Timeline. documents question?

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Hi

I thought I'd start a timeline for my SET(M) application here for info, this board has been immense help in my previous PSW visa and Spouse BRP applications. I will update as I go along.

I have booked a morning slot for premium service at Croydon PEO on 20 August. It is very close to my 26th expiry date but hopefully I will have an answer as quickly as last time.
Slight reservation as the last time I went to Croydon their CRB checking machine was down apparently and I spent a good 7 hours there waiting and no one updating any of the applicants there.

The basic documents I have:
- my passport, husband's passport
- my BRP as a spouse
- marriage certificate
- Life in the UK test pass letter
- UK MA degree diploma
- last 3 month's payslips for both of us and my work contract just in case

I am a bit confused as to the 6 documents requirement: do I need 6 documents (if all in joint name) each spanning 24 months? Or 6 different types of documents to cover 24 months (for example, Aug-Oct bank statement, Nov electricity bill, Dec-Jan water bill and so on...)?

So far I have:
1. JOINT tenancy agreement May '11-May '13 then a mortgage offer letter
2. JOINT council tax bill April '11- March '14
3. JOINT reg bank statement May '11- most recent
4. JOINT savings account statement May '12 - most recent
5. My reg bank statements June '11-most recent + My husband's reg bank statements for same period
6. Elec/Gas bill in my name only Feb '11- June '13 + Water bill in husband's name April '11- May'13 (then recent water bill in my name for June '13)


I've also got tax code letters, other savings accounts, credit card statements but is the above enough? #4 only covers the last year, not 2 years.

Thank you in advance for answers.