*** For copies of rules, etc. please see No. 5 below ***
Although it is now out of print, Waddington's Buccaneer can hardly be said to be an unsucessful game. It was manufactured in various forms for at least twenty years, but ultimately sales apparently dropped below some threshold level and it is no longer manufactured. Of course, the market for board games in general is probably a lot smaller than it once was.
I'm interested in the game is for nostalgic reasons. In the early sixties my Mum, Dad, sister and I used to spend many hours playing Buccaneer. As a child I was fascinated by the detail of the playing board (I remember this of Cluedo too, but don't remember playing the game very much!).
I'm sure there are many unused games and partial games out there... and a few people who would be interested in complete games, spare pieces, copies of the rules, and so on for the same reasons as me. If you are having a particularly bad case of nostalgia and have not obtained a copy of the game yet, I suggest you download the JPG of the game board below. This might tide you over until you can get your hands on a game!
Buccaneer was invented by Cecil Whitehouse & a Mr. Bull. Cecil's daughter tells me that the original prototype board was painted on oilcloth and that Treasure Island was a sort of Lasy Susan arrangement on ball-bearings. It is thought that the friends started working on the game before the war, while they were working at Fort Dunlop in Birmingham. The game was developed mainly while they were on fire watch during the Second World War, probably in 1942. The game was bought by Waddingtons of Leeds (England) but was not marketed very actively until after the patent ran out. This meant that, sadly, the inventors of the game received very little reward.
As a side-note, Mr. Bull was friends with Mr. & Mrs. Pratt who later invented Cluedo, known as Clue in the USA (source: Hasbro web page, now removed).
There are several UK versions of which I'm aware (maybe as many as eight or ten). Variations of the game were also sold in Europe and the US, under different names (see links at the bottom of this page). I'm not sure of the dates of manufacture given, but the copyright dates are confirmed.
The pictures below are of games that were offered for sale on the Internet at some time, but have already been sold. It is version number (3) shown below that I used to play as a child. You will notice that there was a switch from six players to four at some point. I think that this was due to the fact that certain players in the six player game have an advantage of having better access to the spare ports (in that they are nearer to their own home ports). There was also a switch to not having a hole in the middle of the board, and back again. If you are looking to play the game for nostalgic reasons, note that the versions of the game shown in (3), (4), and (5) [and possibly (2)] below are essentially identical.
(1) Possibly the earliest edition, with roll-up board. Six player. This one said to be from the late fifties:

(2) Mid-Fifties?:

(3) 1958 copyright. Red & blue box. Separate, heavy, folding board. Six player:

(4) 1958 copyright on board and rules, red & blue box with (much lighter weight) board in box. Otherwise, the same as the version shown above. Believed to be the version produced in the early- to mid-sixties. Six player:

(5) 1958 copyright on board and rules. Blue box with board in box, but otherwise the same as above. Believed to be the version manufactured in the mid- to late-sixties. Does have a "Treasure Island" hole in the board, although it is not shown in this picture. Six player:
Contents list. Rules/cards (.JPG files, 120k-180k each): Instructions & Rules 1 2 3 4 (or as a PDF) Chance cards 1 2 Playing Board (680k .JPG): 1 (Left-click to view, right-click to save as file)

(6) Late Sixties/early seventies (?). No "Treasure Island" hole in board. Playing area reduced from 24x24 to 20x20 and game changed from six players to four players. In the old game the ports and islands were placed on different diagonals so that it would take an extra turn to get from one place to another. In this newer version things are more "lined up" and symmetrical. This was possibly intended to remove perceived advantages of one port over another, or maybe just to encourage trading at ports.

(7) Copyright unknown. Thought to be identical to No. 8 below, except for the box. Could be before or after No. 8. Four player:

(8) Copyright 1976. I believe this to be the latest "regular" version, manufactured throughout the late seventies and possibly into the early eighties. Four-piece (sectional) board. Four player. Rules for this version: Page 1, 2, 3, 4, 5, 6 (or as a PDF).

(9) 2006 "Pirates of the Caribbean" version from Hasbro. Hasbro revived the game to coincide with the movie release. Much nicer graphics, in my opinion, than the 1976 version but still a 4-player game.

(10) ... and last, but no means least - my favorite picture of all. I was very pleased when in early 2011 I received an email from Cecil Whitehouse's daughter, Dot. She told me more about the invention of the game and sent me a photo of Cecil Whitehouse's own set - complete with hand-written cards. Click on the picture to see a larger version.
The inventors of the game, Cecil Whitehouse and Mr Bull, at Weston-Super-Mare:

A big thanks to Dot for those last two pictures!
Links:
If you have any more information about the game, are interested in obtaining a copy, or have a complete or partial copy for sale, I can be contacted at steve at stevechampion dot com. A big thank-you to all the e-mail correspondents who have helped me piece together this information, and the people whose pictures are assembled here.
"Buccaneer" name and designs are Copyright © Waddington's Games and its assignees. "Trade Winds" name and designs are Copyright © Parker Brothers and its assignees. (In both cases copyright is believed to be now owned by Hasboro). Photographs of actual games Copyright © their photographers.