Target Audience

I have chosen my target audience really carefully and made sure I didn't just randomly pick an age.I imagine that my target audience will be 18-30 year old woman that listen mainly to the breakfast show in a car on the way to work or collage and then the drive time show in the car on the way home from collage or work. I think they would listen in the car because if they got the bus or train I would expect my kind of audience to listen to music on  there Ipod's or phones.Some may listen to my radio station on there smart phones but I expect most of the listening to be done in the car or at home using a computer,laptop,ipad ect.  I think my target audience will live in the UK as my radio station is located in London so will be well known there and other parts of the UK.