Kostas, I stand corrected!
I like many other 'red duster' men always thought that since the RFA worked with the fleet then there was an RNR/Navy connection. The Blue ensign for our lot always suggested a connection with the RN. (River Police? - what river police?)
In fact, many moons ago (I suspect before you were born) I did work on active service with the Navy and the RNR. I did know some officers who were also RNR or was it RNVR (Wavy Navy) who did serve with the RFA. They all got jobs through the 'POOL' (nothing to do with the prefix 'Liver')
I note Titanic did not have a gaff therefore if she flew her ensign at sea, after leaving territorial waters then she did so from her stern and engaged in a bit of 'bull'. I would be surprised if she flew her house-flag at sea!
As a bit of interest: House flags had a bad habit of getting caught-up in stays and fouling on all sorts of things. To prevent this, the flag was attached to the top end of a long bamboo pole. The hoist part of the halyard was then attached to the pole just below the bottom of the flag and the tailing end of the halyard to the extreme bottom end of the pole. When this 'gubbins' was hoisted to the truck of the mast (the top bit for landlubbers), the top part of the pole, with flag attached would be above and free of the top of the mast and any possible thing that might stop the flag flying properly.
Just thought I would share that with you all.
Cheers!
Jim