There are 2 sets of connectors: coax and SCART.
The coax from the ntl box goes to the DVD recorder and then to the TV
SCART output from VHS recorder goes to SCART input to DVD recorder. SCART output from DVD recorder goes to SCART input on TV
When you get rid of the VHS recorder you can connect the SCART output of the ntl box to the SCART input of the DVD recorder.