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No, no upstand as such. The ‘flaps’ from the cut out slip under the flashing of the window, then there’s a while flashing kit to stick on top.
If you haven’t seen it, the restoration couple on yt has a pretty good video on how to flash an upstand. You glue down the triangular flaps to the vertical face then use flexible self amalgamating tape over the corners. Looks pretty straightforward, if a little fiddly.
Trunkie
NotThamesWater
I'll be honest - I hadn't quite got tonthat bit when I posted, as i had a few windows open with youtube on.
It feels like a questionable choice! Yours seems sensible though.
Do you have any upstand?