normally dvdrecorders are connected to other devices by scart (or euro) connectors. you just have to select the required input (AV) on your dvd recorder to record that input.
sky box ->dvdr->tv
sometimes it is possible to record from the TV to the DVDr - but for this you must ensure that your AV / EXT settings on your TV are configured for output as well as input - check the manual.
the DVDR may not work correctly when recording TV directly from the spanish tv ariel - as it is broadcast using a different sound frequency - and unless you can change the sound settings (i think PAL B G etc) you will get a perfect picture but possible noisy sound.
so you can see that if you connect via scart / euro everything will work correctly.