I must confess that I don't know exactly what a divan bed is. But, it might be worth knowing that House of Fraser currently has beds on sale at big discounts - think the sale goes until 6 November. I went in approximately 10 days ago, and the salesman told me that the Hypnos was good (it had two royal warrants, if that is any indication of quality). He also was suggesting Relyon. I think both have websites.
I'm in central London, so am unsure if the sale is on at all House of Fraser stores, but the discounts are substantial - between 30-50%, IIRC.