Should I screed before or after plaster boarding? (The plasterboard finishes above the screed level.)

[MikeSharp01]

We need to lay a thin self levelling subfloor, which will then have the wood flooring on it,  and I would like to finish the Plaster boarding (PB) before we do the screeding and definitely before we lay the flooring, which I want to be the very last job! I appreciate that I will need to protect the lower portion of the PB, along with doors and windows, up against which the screed will flow from splashes etc. Should I re-think and do the screed first & why?

[crispy_wafer]

I suppose if you make sure your plasterboards are cut above the floor, so no danger of sucking up moisture then as you say, protect and crack on.