Three years ago, I bought a Morphy Richards cordless Supervac, model no. 732000, for use upstairs, to avoid taking the mains-powered cleaner up and down the stairs. Shortly after the 2-year guarantee ran out, I noted that a full charge was lasting progressively less time, and at about 33 months old, the battery finally ceased to hold any charge. I called the makers regarding a replacement, only to be informed they were no longer available, and a web search found cleaners, but no batteries. Does anyone know where these may be available please? Any advice would be most appreciated, thank you.