I personally recall the Top Gear Team visit to HERRICK in late 07 when I was out there on Media Ops.
I was quite impressed by their visit - they sat in the EFI till quite late until everyone who wanted an autograph had got one, and had a free question and answer knockabout in one of the hangars. James May did politely decline a charity haircut, but I believe made a handsome donation in lieu. Jeremy did get quite excited over the Minigun on the MERT cab though. One of our nurses had looked after Richard Hammond after his crash, so it was nice to engineer a meeting between them. All this with no cameras following them around, so it wasn't just a photo opportunity, unlike some of the other visitors - I think we could all name a few!