You have to declare your any points made within the last 4-5 years depending on insurance company.
Silly offences such as SP30 wont effect a great deal but after 6 points the insurance seems to go up alot from 6 to 9 points in my experience.
What ever is still legally on your driving license counter part will need declaring. Points are only valid for 3 years but stay on your license for 4. With the exception of very serious offences such as drink driving. Thats a criminal offence im sure.