212,
Actually I think Bristow did the flare tip changes much earlier than that. I remember the old inefficient flares meant that they could often be seen from more than 40 miles, especially at night and in the late 1970s legislation was introduced to stop excess gas being flared off which led to the introduction of the more efficient burners we have today with only very small flames. I think the initial job may have been done by John Whale (though stand to be corrected) in an S61 and because of the problem of external visual reference a Bo105 was also employed to assist in providing a reference itself and passing a commentary on the radio. There should be someone who remembers better than I (because I was either in Iran or BCalH with Speechless 2 at the time
)