I did it myself, following a similar procedure to what I did last time starting with a colour before formula to break down the colour in my hair then a series of bleaches and dyes to get my hair to a light, non orange or canary yellow shade. Surprisingly it didn't take as much effort this time around and within three days I was working with an acceptable colour. As i'm sure you can see i'm not 100% there yet as there is still a lot of warmth in the lengths but overall i'm loving it.
To tone and condition my hair I have been using the Knight + Wilson 'Colour Freedom Toner' in 'White Blonde' now, of course I know this conditioning toner won't budge the warmer tones but it has given my hair a more general ashy base which I can work with. The formula is bright blue and I leave it on for an hour once a week to nourish and tone my hair to the shade you can see in the pictures above. You can use it straight after bleaching to help tone down any undesirable shades left after the process and I have to say it is a joy to work with. I bought mine from Superdrug for around £6.99 and there are various other toners to play with in the range including pink and silver which might be fun to try again (lol) when my hair has brightened up to a more white shade.