I wouldn't hold your breath matey.

I had a policy with greenlight and wanted to insure a second car as a daily.
Greenlight agreed as i had a car with them they would match the no claims on the second as an intro.

Now the cos insurance ran out about 6months or so ago and was not continued due to the car being off the road but been told ncb lasts a couple of years.
The second policy ended recently so i renewed as there price was best but asked if they still had record of my no claims for the cos to which the response was i only had one lot of no claims not 2 so will have to start from zero no claims with a very heavily modified car, where did my no claims go???

Who knows.