I agree with all userswho say use the VCR tuner rather than the inbuilt tuner (better quality + stere).
To record two programmes using a VCR do as follows:
For UK/European users with Scart sockets I am assuming the VCR Scart Out is connected to Recorder Scart In.
or the US/elsewhere (where SCART is not the standard), I guess it is AV connections instead?
Set the times on the recorder to those you want and select Scart (or AV) input as source. Then simply set your VCR to record also at the same times, selecting the correct channels. Of course you will also need to put a tape in the VCR also (a good protection against an unfortunate bad burn with your DVD).
A similar approach applies to sky / digital boxes connected to the recorder via Scart(except you won't need a tape).