Hi Kiwi
Thanks for the copy of the advert , it certainly helps with the fittings and the mast. Looking at the ad and seeing the company information as International Model Aircraft Ltd. Have done some searching under this information and it comes up with some more info but no pictures yet.
The Lines Bros. company was formed in 1919 by three brothers; since three lines make a triangle, the Tri-ang name was adopted as a trademark. Most collectors are familiar with the FROG line of ready-to-fly airplanes which were made by International Model Aircraft Ltd. (IMA); this 1931 company, IMA, was taken over in 1932 by Lines Bros. (Tri-ang) and continued in business as IMA (FROG). Tri-ang took over Rovex Plastics Ltd. following WW2. The Lines Bros. company, or the Tri-ang Group, consisted of the following divisions by 1966: IMA became associated with Rovex Scale Models Ltd, which becam Rovex Industries., makers of Tri-ang Railways; Minic Ltd. at Canterbury, makers of Minic Motorways; Minimodels Ltd at Havant, makers of Scalextric Model Raceways, and Spot-On Models Ltd at Belfast, makers of die-cast vehicles. In 1969/70, the group name was changed to Rovex Tri-ang Ltd. The company went into liquidation in 1971, the end of Tri-ang.
Amazing how many toy companies came out from one organisation.