The only reference I could find from Simon Martin to ET and genius was
‘The conversion to a Pacific wheelbase was remarkably straightforward and the more I look at it, the more I realise just what a stroke of genius it was on Thompson's or Robert Thom's part to go for the simplicity of the equal length connecting rods and cylinder setup. Half the reason it came together so quickly was because they reduced overall design time on the new front end I feel. Either way the Doncaster Drawing office should be praised highly for the turnaround, and the works too.‘
Someone else on the thread quoted
’I'll leave the thread for this evening with the words of R.H.N. Hardy, who was more than familiar with the full experience of operating the original Pacifics at Stewarts Lane: "I think that, without a shadow of doubt, Bulleid was a genius."