My mistake was believing that there were only five 6-figure combinations of 32.
The only combinations that I had that did not incorporate a 1, produced 'spare' numbers of 148 & 139.
The combination I missed produced spares of 157 - Typical!
I knew that the 4-figure combination of 25 was 8764, and that the 6 & 4 were in c4, so it was the 8 & 7 being transposed that was my undoing!
If you're not too fed up with me, can I have the 4th puzzle,please??
Going to my school was an education in itself. Which is not to be confused with actually getting an education (Schultz)