Lost, one large budgie

I was out in the garden the other day with Dino our Blue & Gold Macaw(affectionately referred to as the budgie), who always likes to help with the odd spot of soil chewing to help his digestion when I noticed that one area needed a bit of extra help in the water department.  I went off to start the irrigation after I had put Dino on a branch in a nearby tree. 
When I returned a couple of minutes later, Dino was not on the branch and he was nowhere in sight.
After a few calls of his name and some quick searching, panic was beginning to set in and a nasty taste started to arrive in my very dry mouth.  I went back to the house to check there, nothing and  explained to my wife what had happened. We both continued to search and checked every part of the garden, over and over again, nothing.

Baring in my that this is probably the only bird in the world that hates flying and chooses to walk everywhere, I knew he couldn't be far away, but after more calling his name, searching and whistling, he was still nowhere to be found..
I searched the adjoining fields on each side of the house where the grass was around 4 foot high. I checked all the treetops and surrounding vegetation, there was nowhere within 300 metres of the house that I hadn't searched. I went back to the place that I had left him, now some 30 minutes ago and tried to assess which way he would have flown. The wind was quite strong as it had been for the past couple of weeks and today it was coming from a northerly direction. Assuming that a sudden gust could have caught him unawares, it may have lifted him from the branch and set him on his way and he could well be somewhere down wind.

As I mentioned earlier, Dino chooses not to fly but when necessary, he can and obviously he has today but how far has he gone. Surely he can't have gone far as he will not have much muscle in that area and being a big bird needs a good flap to get some elevation.
The first house we came to had a large white van in the drive and as my wife went to knock on the door, while waiting for someone to answer,  she turned around to see Dino hiding under the van trying to get some shade out of the blistering hot sun, which could have been another reason for taking off from his position in the tree, he hates the sunshine. Macaws are originally from the Amazon and are not sun loving birds, they prefer to be high in the tree tops surveying all before them but in the shade, anyway panic over.