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Section 19 of the Party Act 1996 allows anyone who wants to build up to the line of junction to give notice of that (2) and if you don’t consent to it straddling the junction,(4) he may only build up to the centre line
Section 8 however (1) allows him “during usual working hours” to enter and remain on the land for the purposes of any work required under the act.
Hence, on a strict interpretation, he can go onto your land, with scaffolding if necessary but only during the day which, from a practical point of view means he would have to remove it at the end of the day.
If he decides to just put scaffolding on your land without consent, you can make an application to court for an injunction to get it removed.