You need to buy a SCART lead and connect it from your digi-box to your VCR. Tune your VCR to A1 or A2 - they vary from make to make, and what ever is showing on your Freeview will record on your machine.
You won;t be able to watch any other Freeview channel while you;r recording, but you can change to the terrestrial 5 with no problem.
Don't use your on-screen surf menu while recording - it goes onto your video!
Sorry, forgot - to find the A1 and A2 channels on your VCR, scroll down through your channels to BBC1 and then drop down one, and then another one - there they are.