No worries, just accept my sympathies.
I went through quite major surgery myself in an NHS hospital a few years ago, so I am well acquainted with the stunning incompetence of the majority (yes, majority) of NHS nurses and doctors.
In my own case it went well, but only because I kept on top of them, resulting in an additional course of antibiotics for a resistant infection they'd 'missed'. Even then, it took two further ops, both classed as 'major' to fix a recurring hernia at the site of the original 'keyhole'. All over now but as stated, you and your dad have my sympathy.