Good call on it checking for blood - thankfully the two occasions this has happened have been within 24 hours of drinking a decent quantity of beetroot juice and there have been no other instances. The outcome was consistent in both toilet variants, just more obvious in urine.
I’ll have a check of the ingredients to see if there is anything ‘added’ and label to see how it is manufactured and whether concentrated though - they might be doing something in the processing that has concentrated or altered the product