Currys has gone right downhill.
Not quite. It is the electrical appliance retail industry which has changed, though I wouldn't say "downhill" so much as turned on it's head.
I can appreciate your frustration, madabouthoovers, as things are so very different now, however we must observe that in the face of mass competition like there has never been before, Currys has managed to stay afloat, seeing off their direct rival even; Comet.
This hasn't been achieved by offering a reduced service, out of stock items, and minimal ranges as a matter of sloppiness, it will undoubtedly have been part of a much bigger plan. Currys is no small retailer and to come from where it was to where it is & still be turning a profit does not happen without precise attention to detail.
In effect, one could say that the seemingly poor service and ranges on offer is what has kept the company very much in business. Take the fact you mention they are no longer stocking Sebo. That wouldn't happen if there was a demand for that brand. Clearly Currys customers were not requiring it.
