Dear Tubby and Peanut's Mom
Thank you for your lovely, understanding message. What you said about Peanut's eyes is exactly what seems to be happening with Cleo. Little or no pupil contraction and "headlights" even in reasonable light, and better distance than near vision. I feel better after reading your post, perhaps it is not blood-pressure related retinal detachment after all.

Yes, Cleo had full blood profile and renal was OK - high end of normal range same as last time tested. However...

Vet (Dr Catt, would you believe...) rang today to discuss the Thyroid test results. The vet nurse had said 46 and 10-48 was normal range, so she was high end of normal. Vet said she was concerned there was mild hyperthyroidism and that most cats she sees are in the 10-25 range and Cleo should be started on medication. She said hyperthyroidism can mask what is really going on with the kidneys, so after a few weeks on the tabs she will go back for another blood pressure test and repeat blood and urine tests for renal function.

So I will pick up the meds on Saturday and start them immediately and see vet again 7th October to see how she is going.

Meanwhile I am going to Google search feline hyperthyroidism and learn all I can.

Any info or references anyone has will be greatly appreciated, thank you. Thinking positive here...