Spoke to Halfords and spoke to an independent car audio company. I said I need:
Simple radio with aux in.
Dedicated sub output that I can choose function - sub or amp.
I need sub lead put in now for attaching sub later on.
Halfords said:
it would cost £15 to install a radio.
They said I didn't need to choose the function of the line output - between sub and amp - they said all I needed was a radio with 2 preouts.
They also said they could install a sub lead now but cost would depend on the car and how easy it is to get it done.
The other company said:
They could do all the above BUT:
They said the line to the sub would depend on what kind of underseat sub it is. They then went on to describe something about RCA and plugs on different subs? I didn't understand it. Anybody know what they mean?
They quoted me £230 all in - radio, install including sub lead. Seems a bit steep as the radio is only £60.
What do you think?

Thanks