Just echoing others, do not worry about it Richard as this small scratch won't affect your scope's performance. Just think of dust and dirt that gradually accumulates on each telescope's lens and it does not need cleaning until the lens gets quite dirty (or how big a central obstruction is in some telescopes?).
Maybe this incident is a gift from the universe? I'm sure you will look after your new baby even more carefully from now on and that's why it will serve you very well for many many years to come
