I did an extensive review of washer dryers at the ao and other sites, viewed product availability as well as plus posted reviews and ultimately focused in on this particular Candy Heat Pump Dryer. This dryer replaces a 15 yr old vented dryer. To be honest, before the old unit packed in, I had not come across a heat pump dryer, but was familiar with the concept in heat pump boilers, so it made sense to pursue further. The only observation that I could make out from others' reviews of this dryer was that it took longer to dry clothes to the same dryness level, but with lower energy usage. The other difference was a tank in the door recess to manually remove the condensate after each run, though this can be plumbed away into the washing machine's waste pipe. We may elect to do that, in time.
Initial findings (after 10 days use), are exactly as per the reviews I read. It does take a bit of time to work out the optimum button combination to dry towels, sheets and clothing, however, it does the job, eventually.
The guide book from Candy probably needs proof reading by a mother tongue English speaker, though this is a minor observation. The handbook is also fairly general in its applicability - I think it's written to cover several models.
In summary, it's a good replacement to the old vented dryer, but time will tell if we get another 15 years usage out of the unit.
The Dryer was available, delivered and installed the following day