Don't knock the Handy Zip - its a good one!
The Dirt Devil brand in the UK was owned by ALBA who are now owned by Argos - that part is correct.
However in the 1980s Dirt Devil was as the original U.S brand who sent over the Broomy upright, a larger upright vac, the Room-Mate electric sweeper (I have one) and the Handy Zip bagged hand corded vacuum. Most Handy corded vacs carried the additional name (Royal) as that was the home company who owned Dirt Devil.
Thus as soon as Dirt Devil US ceased the original line up of vacuums they had in the 1980s designed to be put on sale in Europe, the brand "died" back then with ALBA rebadging quite a few of budget "trader" appliances as their own and using other brand names such as BUSH and GOODMANS to flood the market.
Even when Dirt Devil UK was established through ownership by Alba PLC, the U.S produced Handy Zip continued to be sold - it was a popular hand held corded vacuum and still is, these days as it can be used with or without a paper dust bag. I adored mine and owned one for about 10 years - they don't break easy even if they do have plastic fans - unless you purposefully pick up grit all the time.
A separate box of tools was also available including a stretch hose but you'd have to remove the drive belt if you wanted to use the hose alone.
You should be able to get a good price if you give yours a good clean and market it well. Many people who have stairs in their home have a Dirt Devil Handy Zip - they're perfect for cleaning stairs - one of the design functions that went with the product when it was sold.
Check previous threads on here:
http://www.vacuumland.org/cgi-bin/TD/TD-VIEWTHREAD.cgi?6266
and a green one:
http://www.vacuumland.org/cgi-bin/TD/TD-VIEWTHREAD.cgi?22960
BTW don't go thinking that just because the Bush and Alba name are produced by Argos, that every appliance is thus original - the Bush upright bagged vacuum that appeared a few years ago was the same as the Argos Value bagged upright (blue and then in yellow) and was a Vax design.