Happy to help. For CEC you cannot use work experience gained as self-employed, but this is not an issue for FSW.
Below is the skeleton of my reference letter:
To Whom It May Concern
RE: Confirmation of Contract: XXXXXXXXXXXXXX (ID Num: XXXXXXXXXXXXXX)
This letter serves to confirm that Ms. XXXXXXXX XXXXXX is permanently contracted with XXXXXXXXXXXXXX since DD MM YYYY as a Senior Software Developer/Lead. She currently provides software development services to XXXXXXXXXXXXXX and its clients in the following capacity:
Designation: IT Software Solutions Delivery Lead
Role: Software Developer/Programmer (Senior Level)
Duties:
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Contract Type: Permanent Full Time Contractor (minimum of 40 hr/Week excluding overtime hours)
Remuneration: Current invoice rate is XXX/hr (excl. VAT). This does not include any performance related bonus which forms part of the contractual agreement.
XXXXXXXXXXXXXX is a Digital technology and innovative IT solution provider in (COUNTRY). Should you require any further confirmation, please do not hesitate to contact me.