he heard nothing from them since the offence then 4 months later gets a thing from them saying there going to take him to court so i guess this is not legal is that right???
So did he get a ticket or anything at the time of the offence, if he did, that was the NIP, which has to be recieved withing 14days of the offence, then if you dont pay it etc they have 6months to take you to court.
so if he got a ticket at the time of the offence, the NIP was within the time limit, and he had been summoned to court 4months on, which is also within the summons time limit.
even if the summons is above board, I would still challenge the calibration of the speedo or camera.