Although I dont have the exact same set up as you, this is how I do it.
V+ to TV via HDMI
DVD/VCR to TV via HDMI
My TV selects the HDMI input aotomatically although you can overide it manually using the 'AV input' button on the remote if needed.
To record V+ to DVD/VCR machine, run a scart from the 'VCR' socket on the V+ to the scart socket on the DVD/VCR recorder, you will have to see which scart socket on the DVD/VCR is labelled for input, it might say 'decoder' or 'sat'.
To record the V+ box, you have to select the correct AV input on the DVD/VCR machine. On mine, if I run thru the channels backwards it changes to the AV inputs. For example...channel 2 - BB2; channel 1 - BBC1, AV2 - item tonnected to scart 2; AV1 - item connected to scart 1 etc.
You have to remember to leave the V+ box on the channel you wish to record.
Sorry couldnt be more detailed but hope this helps.