Connect the DVD player to EXT1 with RGB via SCART and sound via co-ax. Nokia box to EXT2 again via RGB SCART.
As you have an S-VHS VCR it would be ideal to connect this to EXT2 as well as it can handle S-VIDEO via SCART.
If your digibox has a 2nd SCART socket, connect the VCR to this and (hopefully) the S-Video signal should pass through.
Failing that, connect the VCR to the front (actually side) S-Video connector on the TV [you'll still need to connect the VCR and the digibox somehow so that you cna record from it].
The SCARTs given to you should be alright as long as they have all 21 pins connected (ask the store).
Hope this helps