Managed to get up to Wiruna to collect the LRGB data for this image, Ha taken from my trusty light polluted back yard. Greg's recent super wide field images provide great context for where this open cluster and nebulosity is situated, near the prawn.
Big size here
Original size here
The hydrogen around the dark tower in the lower right is being ionised by the stars within NGC6231, which contains three WR stars.
Must have been a little careless setting up as I've ended up with some slight field rotation, try not to look too closely!