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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’ll be honest, most sparks I know aren’t interested in doing half the job for you to finish up (I might be misunderstanding you on this, if so ignore me). Having a break while it’s boarded and plastered is one thing, but they won’t want to leave work to be completed by a non-spark. It’ll need to be tested once second fixed before it gets put into service.
You’ll need to get quotes for the whole job, breaking it into small pieces makes it a lot less desirable. Having a gap for works to be completed is fine as long as they know the schedule.