A Henry will do the job, but I found the bags would clog up too quickly. I use a Nilfisk multi 20, a great machine. The wall chaser plugs into the Nilfisk, when you turn on the wall chaser the nilfisk multi 20 automatically turns itself on. Also the bags last for ages before they need changing. A cracking piece of kit.
Interestingly before I purchased the nilfisk, I bought a
dusk extractor from screwfix (see link below) and when I read the instructions it said 'not to be used for dust'. Work that one out- needless to say it got returned.
What a waste of time and im sure there is some trade descriptions act in there somewhere
http://www.screwfix.com/p/woodstar-dc04-54-3ltr-sec-dust-extractor-230v/61772
check out page 11 of the instruction manual