When filling with diesel today there was visible "steam" coming out of the filler as I was pumping diesel in. Temperature was about 5C or 6C. I've never seen this before and struggling to come up with a rational explanation. The air wasn't cold enough for my breath to show, so I can't see it being a matter of warm air being displaced from the tank.

Any ideas? 2005 D3 2.7 Auto
Previously:
2010 MY FL2 TD4e GS - Now gone at 199,500 miles, about 135,000 of them mine.
‘93 Defender 110 200TDi CSW
‘87 Defender 90 4 cyl Petrol
‘83 110 CSW V8 - best ever!
Range Rover 2-door V8 (not sure of year - 4-speed box and vacuum diff switch)
Series III SWB Diesel

The fuel system has a feed and return system where there is a constant flow of warmed fuel back to the tank when the engine is running. Possibly you had just fueled after a long(ish) run thus the tank fuel was warmer than the new fuel being pumped in.

Bob 10MY (Sept 09) TD4 HSE Auto in Stornoway Grey (Now Gone)

08 FL2 TD4 SE Manual in Rimini Red (Now Gone)

I think that was a common 'feature' of FL2's. I'm sure I used to get it on mine as well as on my Evoque. Past: FL2 TD4 HSE Auto
Evoque SD4 Dynamic Lux Auto
Present: Audi A3 S Line.

Ok, thanks guys! Yes, the engine was properly warmed up. I was heading back home from Glasgow and was filling up in Perth, so I had done about 62 miles. If this is a common feature, I'm surprised that I've not seen it before. The filling station is undergoing a refurbishment and the fuel nozzle was coughing and spluttering as I was filling the tank, so I was worried that the "steam" was an indication of water or water vapour in the diesel. 2005 D3 2.7 Auto
Previously:
2010 MY FL2 TD4e GS - Now gone at 199,500 miles, about 135,000 of them mine.
‘93 Defender 110 200TDi CSW
‘87 Defender 90 4 cyl Petrol
‘83 110 CSW V8 - best ever!
Range Rover 2-door V8 (not sure of year - 4-speed box and vacuum diff switch)
Series III SWB Diesel