Complete Level 3 spreadsheets software with workplace evidence?

Hi

I have decided to self study for level 3. Today I passed my Accounts Preparation unit having only used the Osborne tutorial and workbook (I highly recommend them, the parctic assessments were just like the AAT assessment so it was greally practice). I will continue to do this for the rest of level 3 as it's cost effective and I can work at my own pace. However, as I understand it you need to be signed up to a learning provider for the spreadsheets unit. Which I do not want to do. I am hoping to pass it providing workplace evidence but am not quite sure how to go about that? Is there a list of what is required anywhere? Has anyone done it before? Thanks!