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I wouldn't use ct1 flash band and flash band primer would give you longer lasting results. The only thing that would beat it would be proper lead flashing.
While you're up there worth checking that there actually is a fall on the flat roof (should be around 1:10) and that it falls away from the house, I know it's obvious but the number of DIYers that get this wrong is significant. If this isn't the case then the work will be more than you initially thought.
Also with the access towers (decorators platform). Be careful where you hire it from as some hire firms will insist that they see evidence of a PASMA qualification when they drop it off and if you can't do this will take the tower away and keep the cash.
We have a porch (no, stay with me please)
It has at some point been vandalised and converted to a flat roof thing.
It is now leaking where the flat roof joins the face of the house.
I want to bodge-fix it with CT1 but access will be difficult / dangerous with just a ladder. Other than a picker, is there something else I could use that would be safer than a ladder that's easy to acquire or hire? Scaffold will be massive overkill I think.