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I gave up out of frustration after checking through the suggestions from the always helpful team.
Thanks all.
As an interim measure I just reloaded FSX-SE.
It's mainly so I can install those...

Thanks for the suggestions team.
Can't mix up the discs as they have contrasting designs printed on each set.
One I purchased not long after FSX escaped MS and the other around 2010 at a sale...

I decided to reload FSX 'Gold' today (some things just work in it!) and all went as per normal until I inserted the Acceleration disc.
Twice it told me I need to install it into an 'English' version...