I finished it!
In truth I finished weeks ago but hadn't updated here, I ended up just doing one last repeat of the teal, which was the first colour of the various bands.
So there are three repeats of all the other colours and 4 of the teal, The blanket lives on my chair where I craft, It covers my lap frequently on chilly evenings as I knit up dolly wear.
This was the largest Crochet project I have tackled and I am so pleased with how it turned out! I wouldn't mind doing a bigger ( wider mainly ) ripple in the future sometime as it is quite a soothing and rhythmic pattern to work, I really enjoyed it.