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I get you. Loose scheduling can be tricky. Some won’t mind being flexible, but multiple trips to do small bits of work is never as profitable as turning up for a couple days and doing the lot.
Organising your own plans to maximise what can be done by the spark on each visit, and giving them set dates for when the work is to be done will definitely help, but it’s still a pain that they might just want to avoid.
I've not explained myself particularly well, I think - I'd want a registered spark to do all the design, install & testing and paper work (bar the SWA burying, as I did that 3 years ago) - It's just that my schedule is rather loose, being a DIY build.