It was down to the LG and the ASUS.
The ASUS in my price range came with two HDMI and one VGA port, and the LG had no VGA, so I went with the ASUS. I have a couple of older computers here that I plug in to the monitor from time to time (Windows 7 and earlier) so I needed that VGA port. So they'll bring it round on Sunday - "ASUS 31.5" 1080P Monitor (VA329HE) - Full HD, IPS, 75Hz, Adaptive-Sync, Eye Care, Low Blue Light, Flicker Free, HDMI, VGA, Wall Mountable, Tilt Adjustable"
Thank your son for us for the advice, though!