On an impromptu trip to Primarni I came across a bun ring for £1, I have always wanted one but have never been that bothered to go out of my way to get one, but after using it I wish I had.
All you do is put your hair in a ponytail
Put your ponytail through the hole in the bun ring
Fan your hair around it
I then put a hair band around it to secure my hair in place, alternatively you could use hair grips (but I find a hair band is much quicker)
I then use hair grips to pin any longer bits of hair under the bun so they are nicely hidden
And voila your bun is perfect and your ready to go...