Hi Graham

However, if you want a cleaner that does not rapidly loose suction
after you change the bag then a Dyson.

Depends on the suction you have to begin with. Last test figures I
saw, a Henry with an 80% full bag still had more suction than a Dyson.

Apart from which, no need for a bag in a Henry anyway. The main filter
does the job and just needs ahaking out.

Dave