The A400M has been designed from the outset to be capable of being refuelled, and of refuelling other aircraft - so there is a quite a bit of air-to-air refuelling work to be done during flight-test, all of which started this week.

Residents of Toulouse used to the ever quieter sound of current generation aircraft had a brief reminder of the good old days when a Royal Air Force Vickers VC10 tanker with its four Rolls-Royce Conway engines briefly visited to let the A400M begin trials as a receiver. (Happily the VC10s, magnificent as they are, are being replaced by Airbus Military A330 MRTT tankers - known as the Future Strategic Tanker Aircraft, or FSTA, in the UK.)

In the tests over the last few days the aircraft have conducted 'dry contacts' - in which the receiver plugs into the VC10's fuselage-mounted hose and drum unit (HDU - or "hoodoo") but no fuel is passed. The main focus of the exercise is the aerodynamic interactivity of the two aircraft in close formation. And in fact it turns out that the A400M flight control system is going to need a little tweaking for the refuelling operation - exactly the sort of thing that test-flying is designed to identify. But nothing too serious.

All of this air-to-air refuelling makes for some great air-to-air video as well of course, including the first shots taken though the HUD which you can see below from on board Grizzly 1.