Transcript amends and support

Hello. I am looking for a script writer to help with a script. We currently have a full, approx. 20‑minute script consisting of 4 pieces‑to‑camera, plus some B‑roll. I need to add an additional expert interview that elaborates on the points made in the pieces‑to‑camera. I also need guidance on where each section/chapter ends, so I can add graphics to separate each story.
My budget is £100, and I need this done by EOP today or tomorrow morning at the latest. I will share the existing script, the transcript of the new interview, and the cuts/clips prepared so far. Thank you.