Thanks Trevor,
If the postcard was sold aboard, I would be rich by now! LOL
The same postcard (published by National Series) was probably sold all over England in 1911-12 as well as on board the ship (very unlikely my card came from there, as all those on board will be still at the bottom of the Atlantic) - thats the provenance of my card!
BTW, along with Tucks', National Series cards seem to be of better quality and are also popular with collectors. (There is also an National Series black and white post-sinking card of the Titanic, which is slightly more common)
And Trevor, did you buy the Tucks' Titanic card? You should - its quite highly sought after!