Got this up and running thanks to @karsten13 's help with screen blanking. Also had start-up issues as detailed here.

Runs on a RPi 4B I had lying around with MagicMirrorOS driving the fabulous RPi monitor with a PIR sensor to sense people in the room for screen blanking. Viewing angle on this screen is very impressive, very sharp and crisp display.

The Pi is in the boiler cupboard and wiring is hidden in 25x16mm trunking painted to match the wall. PIR sensor is in the tiniest project box I could find. Screen is on a VESA mount.

MagicMirror modules:

• MMM-Universal-Pir - controlling HDMI for screen sleep
• clock
• calendar - hidden, pulling UK Holidays and Family Google calendar feeding:
• MMM-CalendarExt3Agenda with CSS mods so it fills most of the screen
• MMM-MyGarbage
• weather showing current and forecasts from UK met office
• newsfeed showing BBC news