Some interesting history
here
And a sales (?) brochure for the 430
here
Table 1 in the 430 document would have been good fodder for JT to expound at the College
I have never personally worked with either a 424 or a 430 but remember watching Hurn Approach working with their 430 and flying several half-milers to 17 (also Hurn) whilst doing my instrument flying intro in a 152 - in fact it was under the hood right down to the flare as my Instructor carried on the patter once the SRA was terminated.
DD