Semi-rigid Rotor:
Your memory's not too far out!
bmal-76a+ 49,900 landings, 23,395 hours.
drnt-76A+ 57,600 landings, 19,057 hours.
chcd-76A+ 57,700 landings, 18,333 hours.
and the baby of the fleet, sssc-76C 26,500 landings, 10,400hrs.
Some ex S61n drivers might say these are all babies! Unfortunately decisions taken long ago regarding certification of the S76 & the introduction of 2 crew(not that that stopped the Scillies crash) mean that there won't be any replacements in the SNS for some time yet.
4th.Rock from the Sun:
Most of the new technology you quote is being introduced elsewhere in the N.Sea & not in the UK sector. The S92 utilises S70 technology & is hardly new, although the americans would like you to think otherwise.
As for the other improvements you quote, I suggest that they probably came out of the oil companies petty cash. The facts remain that transportation costs for all forms of transport in the N.Sea don't figure on the oil majors radar. i.e.less than 5% of their operating revenue. Meanwhile the government & shareholders are enjoying a tax/dividend bonanza.
with fraternal greetings, ambi