OK. I decided to give this whole biso a go.
I opted for the easy single bottle of creme peroxide solution.
I used a black light I have had for ages. Not sure if it is actually UV light but decided to give it a go
I created my retrobright chamber of light (cardboard box and al foil) and got cracking.
Before I started
First treatment picture again
Here is after the second treatment
Third Treatment. not sure if the pictures show much difference but it has gotten rid of some very minor blemishes now