Thanks for your reply Paul.
As you say, it does seem to run warm and I suspect it has something to do with the flash being powered by the camera battery and being put under more load.
In any case, the results are fine so I'll stop worrying!
|Hot Air Balloons Over Bagan by User9320321874|
|Blue mood by darub|
from Fixed lens shootout.
|Yellow Warbler by LeeS|
from A Big Year - birds
|Waiting for the Parade by tcoker1103|
from - La Vida Loca - (Black and White Street Photography+ A Border)