widgeon - yup, you're right about a Westlands test pilot bending a Lynx during a slow roll - must have been late '72 or very early '73. He didn't continue in that employment(!) and I ended up working for him in '73 on a new offshore operation. He later went on to work for a rather well known Gas exploration company in a senior aviation role.
I must agree with the remarks about Dennis Kenyon - I have never seen a helicopter display like it and have to admit turning away during some of the manoeuvres as I hate seeing helicopters crash - but he always seem to pull it off.