Flag Query and Etiquette

NB Snowgoose was in town today. Unfortunately there was no-one on board when we passed but she was sporting the Queensland territorial flag on a mast on the roof and this flag on the tiller swan neck.

I am not often bamboozled by a flag. I can usually track it down somewhere. But this one has got me foxed. It might be based on the old Australian Colonial flag with blue stripes overlaid.

Can anyone, the skipper of NB Snowgoose perhaps, tell me what it represents.

A small point of etiquette for visiting narrowboaters. If one has ones national flag or ensign on a vessel it is customary (as a courtesy) to fly the national flag of the country you are visiting higher than the flag or ensign. The Union Flag should have been in the place of the Queensland flag.