Can I use this in a 750mm wide tiled wetroom?
Drain's total length is 740 and cover length (visible part after tiling) is 700 mm so the answer is yes, you can use this in 750 mm tiled wet room.
You will have 25 mm from each drain's edge to the wall which may not look the best (you will have only narrow 25 mm tile in between the drain and wall) so you also may consider going for 600 mm drain. They are available in lengths from 500 to 1200 mm.
I will be happy to assist if you have any questions.
David 020 7193 0953