Sadly the PCBWay PCBs won't be here before the end of the opamp contest. they should be here towards the end of June.

I just got a message from them to confirm some discrepancies between the BOM manufacturer's part number and the description. 

A couple were just me being lazy about the description. Eg a 0R resistor is actually 5mR so the description was 0R but the part number says 5mR.

One was a genuine whoopsie on my part. When I put the 470k part number in I appear to have copied and pasted the 10k resistor part number. Oops! Fortunately it's been spotted before build. So thank you PCBWay! As it was my mistake I'll happily fit the right part here if it's a problem.

Lessons for new players - there's a reason for putting the description in the BOM. Even though the part number should be plenty, errors pop up and the description can be useful for spotting them.