[logi06]

I have read comments about scabby potatoes and note it could be lack of water maybe?

I grew them in builders bag, I read they get bacteria. Could this be made worse be the bags rather than in the ground, in additional, hence why they were dry.

Thank you

[Yorkie]

Dryness can result in common potato scab, yes.  Also an alkaline soil.

https://www.rhs.org.uk/advice/profile?PID=230

I wouldn't have thought the bags themselves had the pathogen, but depending on your watering regime and the soil you used (if instead of compost), drying out might have been an issue.