Loud engine knocking - big end?

[NotAnotherHill]

Found the problem: The plate and the fixing washer that the secured the link that fastened the chain together has come off. The link was half way off. Christ knows what damage it would have done If it had come off whilst riding. Brand new chain as well. I'll be taking it back to the garage that fitted it for them to sort. The sprockets, washer and nut seems ok and I can't see any damage as a consequence.