Insurance on 2 cars

[artfuldodger]

For about three years I had 2 cars.
When I insured the second (with the same company as the first) I was told that I have to build up a NCD on the second car as it is treated separately.
Last year, I had a minor claim on the second car (�600) and three months later, sold it.
Will the insurance company now penalise me on the first car by reducing my NCD and should I declare it when I come to renew?