Stage 1 Carte de Sejour experience

We went to our local Prefecture in Finistère to make an appointment. Based on a separate experience, we were expecting a wait of hours to get to the desk, so we were pleasantly surprised to be only minutes away from our turn.
Here, a man (who spoke only French) wrote down the documents we needed and told us which we needed translating. These will be different depending on your set of circumstances. We were then given an appointment 6 weeks ahead. We struggled to know quite how to "prove enough income going forward" (which proof we have to have translated) and decided on the annual pension statement from the government. Subsequently, a friend has informed me that you can obtain an official statement of entitlement from the Overseas Pension Team (in relation to the State Pension) Here's a list of numern that might come in useful for that:

State Pension
Telephone: +44 (0) 191 218 7777
Textphone: +44 (0) 191 218 7280
Monday to Friday, 8am to 6pm

Pro-rata Employment and Support Allowance (PRESA) 
If you were given PRESA under European Community regulations.
Telephone +44 (0) 191 218 7680
Monday to Friday, 8am to 5pm

Employment and Support Allowance (ESA) 
If you were given ESA under UK regulations.
Telephone +44 (0) 191 218 2050
Monday to Friday, 8am to 5pm

Industrial Injuries Disablement Benefit (IIDB)
Telephone +44 (0) 191 218 7650
Monday to Friday, 8am to 5pm

Jobseeker’s Allowance 
Telephone +44 (0) 191 218 7652
Monday to Friday, 8am to 5pm

Bereavement Benefit or Widows Pension
If you’re under UK State Pension age
Telephone +44 (0) 191 218 7608
Monday to Friday, 8am to 5pm

Incapacity Benefit and Maternity Allowance
Telephone +44 (0) 191 218 7644
Monday to Friday, 8am to 5pm