It's possible that my testing was incorrect; I find it difficult to believe all 3 things are faulty, but it's possible.
FAULTY Nextbase Twin Portable DVD Player READ BELOW
FAULTY Philips DVP3005/05 10-Watt Dolby Digital Progressive Scan 1080P HD CD/DVD
*FAULTY* Philips PET1031/05 Portable DVD Player Campervan Caravan SPARES
Faulty PHILIPS DVDR3320V/05 DVD Recorder/VCR Unit Only
Faulty Philips DVDR3432V Black Dolby Digital DVD/VCR Recorder Home Cinema System
FAULTY Philips DVDR3320V DVD/VHS Combi Recorder NOT WORKING
