Sorry to hear that Chris,
Yes I would strip it as the smallest piece could wreck the internals if left. As for the bore it will need a re bore and it sounds like a nicoseal plating (looks like chrome) If you take the bores to an engineering firm that specialise in re bores linings ect they will have the parts required.
some one on here will know a reputable place near you,
Rotten luck Hope you get sorted quick.