Thanks everyone, sorted now. I will add a note later to say what we got, what we paid and how it's worked out as it's been bought for a specific one-off job (so I will post a picture of the site as well) and if it's too heavy, poor quality etc I personally will end up with egg on my face ;-)
We usually have an open / training day in September and I was going to suggest that anyone who wanted to try it out would be free to do so buuuuuut.... our offices certainly ain't that high and it's pointless just looking at them without trying them.