I have just bought a '98 Vauxhall Corsa which has the most basic stereo in
it. It does not turn on and off with the ignition. Looking in the manual
only the higher spec ones do this. My question is if I get hold of a second
hand higher spec stereo is it a straight swap or will I have to add or
change the wiring for this this feature to work?

Thanks in advance for any advice.

Steve