Quote the Doctor, and I love Fish-tail Bonanza's. "Maybe I am missing something here, but how is the LHR Rwy 12 RNAV Appr a higher workload than any other RNAV approach?"
Fair point, it is no busier than many other RNAV approaches throughout Australia.
But if you conduct it faster than required then you get real busy real quick.
Death happens at the same rate though: INSTANTLY.