You can purchase extra minutes at £7.00 per package to add to your existing Ad time for the week. So if you have one show a week, and you already have an Ad pack, this adds another 3 minutes a week for use as with the standard 3 and 1 minute package.
if you purchase a £12.95 package for the week and you have one show a week, this means that you can only deliver a 3 minutes of Ads during that show. And If you have 2 shows a week, you can still only deliver 3 minutes of Ads over the 2 shows that week, making it 1.5 minutes of Ads on each show or any combination you see fit.