Have you tried connecting to the VCR SCART?
I presume you have connected the video sender to the SCART socket labeled TV on the V+ digibox. Unfortunately the HDMI option on the V+ disables all live TV output via the TV SCART and RF, therefore if HDMI is being used as the main output you will lose the other connections until this is then disabled.
The only connection that isn't disabled is the VCR SCART but this isn't meant for live TV; it is used for backing up your V+ recordings to DVD Recorder or Video Recorder. However it is claimed that live TV is still streamed to the VCR SCART but without any of the onscreen menus normally viewed.