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NotThamesWater
That's a great idea !
They have built well inside the line of junction by the look of it, but flashed down to the centre line.
So once you take the slates and battens off the side of their dormer revealing the sheathing - you will need something to fill that gap. Vertical slates and flat roof will have to be flashed into a new raised party wall or .... continue across to your new dormer, with a timber frame party wall in between.
Ironically it would be easier to join the two if they had built to the centre line of the wall.
If a wall is built astride (with permission) - costs should be shared for that wall.
I don't think they can insist you do what they want - but either way sounds like party wall surveyors will need to thrash it out and you are going to need some drawings showing details of the proposed construction from someone.