@excalibur2 Thanks for sticking with me and I'm glad to report that "we've" got it going. Tried quite a few new batteries that I have and no success. Time for a different approach then.
Hopefully I can explain the weird events in the correct order and fairly easy to understand.
!. Tried new batteries. No success.
2. Cleaned contacts. No success.
3. Took a battery holder and batteries from my Yashica FX D and although the fit isn't brilliant ... SUCCESS, everything works.
4. Put the holder and batteries that were in the Ricoh into the Yashica, expections were ... it wouldn't work. SUCCESS
5. Reversed them and the Ricoh wouldn't work again.
Totally weird and no idea why or how this can happen.
Exactly the same make of batteries. Saved me having to choose between repair or despair.