Terry Webster (sometime bassist with Jet's backing group in the second half of 1962) posted useful recollections of his time as a Jet Black, including a link to his website.
One of the pictures to be found there was a newspaper clipping showing an early line-up of the group. It was in a bit of state, but I've done a bit of work on it, bringing it at least up to the standard where the personnel can be seen and the caption deciphered.
Here it is (don't expect too much!):
https://anonimag.es/image/JT9sGfw