What a method statement needs, without the waffle.
RAMS (Risk Assessment and Method Statement) is the document that shows you have thought the job through. Clients ask for it, and a good one keeps your team safe.
List the hazards (falls, dropped objects, edges, weather, public), who is at risk, and the controls. Be specific to this site, not a generic template with the address swapped in, assessors and clients can tell.
Describe how the work is actually done: access and egress, anchor points and rigging, the work sequence, exclusion zones, and communications. Include the rescue plan, every rope access job needs one.
The best RAMS is useless if you cannot produce it when a client or HSE asks. Keep your method statements and inspection records where you can pull them up on your phone, on site.
This is general guidance, always follow IRATA ICOP and your own competent-person judgement.