No that is not the photo. The fuses are all three FRS-R fuses. The connections were all sound. The replies in the first three posts seem to me to be the most likely reasons. Although I'm not quite sure why the spring clips would have lost their tension unless it was progressing to that point over the last few years or months and finally simply became to weak. I am putting those clip clamps on as resqcapt19 suggested.
I guess here's a prime example of where thermographic imaging could have caught the problem early on before it failed.
