I took out the three year service plan to run alongside the three year warranty when I bought my CT. This is/was a Honda package and cost £575. This included three annuals and the 600 service up to 24,000 miles. Not sure if its still available as i think they lose money on it because at a guess the 16,000 probably costs £300. Whether this is for you obviously depends on your annual mileage.
Regards Rob