OMG, I just noticed what the circled letters represent... coulda saved some time, prolly, if I'd looked at those. Obviously they're not needed to get the solution.
Well done! I’ve been on the fence on whether to include those (I’ve done so for some in the past but not all). Apparently my cluing is such that it’s quite difficult without so I’ve decided to include now. Good point — I’ll modify the note to make these explicit!