Thanks Frank.
I just had an email back from Nissan and apparently all rod bearings now come with a hole. They sent me this pic of a batch that has just arrived.
So panic over :)
I recently swapped the pistons in my spare 1.3 engine for 1.0 piston.
During the swap out I managed to put a scratch in one of the conrod shell/bearings.
I emailed Nissan and they linked me to this replacement part...