Thanks all for your advice. I've fought damned hard to improve the quality of our training in the mistaken view that it would push operating standards up. I tend to get a little bristly when those standards are threatened as enforcement of the (outwith my remit) is the only way we're going to improve performance not side stepping them every time we get some driver resistance. I understand that standards are a little different stateside and I have considerable respect for our GM. We binned our man baskets in favour of self propelled MEWPS. I have consulted both RTITB head of standards and my original training provider. The answer was the same on both occasions: Apply handbrake/select neutral prior to and during the use of hydraulics. This secures the vehicle at a time when the centre of gravity may be elevated and allows the operator to focus on the hydraulic function. It also prevents inadvertant movement of the vehicle. The point made about positioning of the load is a fair one but can be mitigated by accuracy and geometry of positioning and precision in manoeuvre. Thanks once again gents.