In message , Dave W
writes
On Tue, 12 Feb 2019 08:31:51 +0000, Graeme
wrote:
Hornby Dublo was a play on Hornby Double O, emphasising the then new 00
gauge.

I never realised that because I pronounced it "dooblo"

Shame on you :-) You are far from alone though, and then there are the
eBay sellers who insist on listing Hornby Duplo ...

--
Graeme