The same in green...
Promotional prints and postcards of the period used white from main deck upwards.
It's very hard to tell there’s a colour difference on black & white pictures, if you don’t know what to look for. It’s even difficult to see on some colour photographs. But there’s visible difference on pictures dating back to 1948.
I'm not certain how they made the separation between the light green and white towards the rear. I could only find close up colour photographs from after the 1965 refit - when the large lido was installed, and it’s impossible to tell from the B&W pictures I have.