Nice find Joe. That's the earlier configuration, before the fitting of the larger air intake filters which, from memory, were added after a serious FOD incident some years back, along with other mods and up-dates.
Here's a couple of pics taken at Duxford in September 2013, showing the current appearance. The chopper had arrived and positioned for a display later in the day, then was called out on a 'shout' and had to make a rapid departure, whilst the 'Flight Line Walk' was still open, hence the people in the second shot.