Only way to rescue in those days was an helicopter snatch rescue as no cherry picker big enough back then. And they were not trained in any rescue procedures either. I've done about 16/17 annual working at height rescue courses which involves assisted rescue and snatch rescue with first aid.
So many(nowadays mandatory) health and safety issues breached it would give an HSE inspector a field day, they'd be sacked on the spot!
No PPE(personal protective equipment)harness, steel toecap boots, safety helmet, gloves, no eye protection and respiratory mask for dealing with harmful Guano deposits (bird shit) No risk assessment, method statement no 6 monthly PPE tools rope and ladder inspection . Just a balls of steel "you'll be alright" attitude lol. Working out of a bosuns chair with just the friction of(what appears to be) a rolling hitch knot had me shuddering, plus those old fashioned cotton/hemp twine ropes were chaffing on the stonework edge.
I've worked a lot higher than that but with correct PPE and training and it gave me confidence to work safely. I wouldn't like to have done what John Noakes and the rest did as you're a long time dead, as they say.