Oh dear. I unplugged the router before going to bed in order to save electricity and when I plugged it back in I used the wrong power supply. The resulting smoke and smell of charred circuit board led me to believe that the router was destroyed. I went into PC World to find a replacement and chanced upon a Belkin N Router in the sale for £60.
The setup was quite easy. The only real difference between the old Dlink and the new Belkin was that the routers IP address was slightly different. It was easy to change it to the old one and so preserve my bookmarks.
I am very happy with the MIMO functionality. I haven’t had any dropped connections while working from home and haven’t yet had to reboot the other. The Dlink suffered from both dropped connections and occasional lock ups.