Interestingly, the above advertisement was to launch the Dublo-Dinky range of vehicles that was used to promote the Hornby-Dublo 00 gauge and there were lots vehicles (cars, vans, lorries, buses and coaches) subsequently issued which all appeared to sell well at the time up until the demise of Meccano. The advert was purely illustrative artwork only and the vehicles featured were all 1:48 scale but never issued in the correct scale for 00 apart from the bus. There's a nice section in Michael Foster's Hornby-Dublo book on 'The Dublo Dinky Toys' pages 270 - 275. Plenty of brilliant 1:43 scale die cast vehicles around today for 0 gauge though. The IXO buses and the Oxford Diecast coaches in 1:43 are superb - see https://shamrocktrains.com/products/british-o-gauge/143-vehicles/buses-and-coaches/ and https://www.paintinghistory.co.uk/resin-coach-passengers