Was given this link to have a look at http://www.vase-express.co.uk/vases_clear-vases_20.html and came across these vases and they come in packs of 10 and they come in different colours here are pics of the clear and blue vases. They are called Magic Vases, they are made in plastic and when filled with water expand so you can put your flowers in. Our Magic Vases are unbreakable, sturdy and easy to store away.

I'm thinking looking at plastic vases would be better not only cheaper but the fact we we will have children at the wedding and accidents can happen the last thing we want is broken glass.

Just found they do different sizes:

Large Magic Vase - pack of 10 Height x 30cm £27.50 Medium Magic Vase - pack of 10 Height x 17cm £16.50 Small Magic Vase - pack of 10 Height x 9cm £11.00