Right, you need a "snap lock connector" which connects 2 cables together. Inside it has 2 channels, you put 1 wire through one channel and the 2nd wire through the 2nd channel (even if the 2nd wire is terminated) and then press down VERY hard with pliars.
Be careful to do this well as my 1st attempt lost the connection and I had to redo it.
These are VERY easily available from Halford or Maplin.
http://www.maplin.co.uk/Module.aspx?...ectors&doy=7m7
If you do the job properly then you want to solder the correct metal O loop on the cable, however this is quite large and needs to be the right size. Stripping away a good inch of cable, wrapping it around and holding it under the nut as it's tightened does work.