Tier 1 Evidence for absence

Hello,
I tried to read through the posts if someone is having a case similar to me but could not find so putting the question.

I was contracting for a client through and agency for an year and using umbrella company services instead of my own limited company. Umbrella company processed my payroll by invoicing my agency after I provided them the time sheets for each week. I was paid for the hours I worked. My salary slips were generated weekly. I had gone out of UK for personal reasons for 5 continuous working days (1 week) in that year so there was no invoicing for that week and hence there was no payslip.

1. Now firstly since I worked through umbrella company, for visa purposes will I be classed as employed or self-employed for this period?

2. If I am classed as employed (not self-employed) will I need to provide letter from umbrella company to explain the absence? Now what does annual leave imply here?
(and If I am still classed as self employed I believe it suffices if I just provide a letter myself?)

To add to my previous post: these 5 days were the only 5 days I took off. So if I am classed as employed (rather than self employed) these are much less than 5.6 weeks required by law (right?) for "employed" people so does it still require employers (the umbrella company) letter?