I have 1 BT Renown System for sale with one of the system phones. Still in original boxes. Only been taken out to check it was all there when I bought it but I have never installed it due to time. It is now clogging up space and I want rid of it. As far as I am aware it is still in working order. There are no sockets for it but I think you can get them from hardware stores or on eBay.
That's all I really know about it. Will post on recieving payment, if its a cheque will not post until clearance or you can collect it from me. I live 10 minutes from Humberside Airport and 20 minutes from the Humber Bridge.