BUSH video player (Balerno EH14)

BUSH video player, Model VCR 905SIL/A It's in very good condition cosmetically, but I'm unsure of its working condition. I tested it with the one video I have left and there was picture and sound, but on and off. I'm not sure if this is down to the player, or the very old video tape. Includes scart and power cables, manual and remote control (batteries not included).