Loud engine knocking - big end?

[NotAnotherHill]

No knocking with the clutch in or when not running power through drive chain. I had the front sprocket done recently and had new chain and sprockets. I'll have a look again but I only checked the nut last weekend and it was fine. Tyres look fine although the rear is due for a change. I'll have a look at the swing arm. Cam chain is rattling a bit but not too bad.