The WD40 fix worked for me.
Totally stunned.
The number of times over the years that Dyson had to be called out to sort out the innerlock (for both mine and my sisters CR01&02 - we're dyson junkies!) is shocking, when all it needed was something as simple as WD40.
Each time we had to pay the standard dyson service cost.
No wonder they stopped servicing the machine, people would have eventually gotten to know how they're robbing their loyal fans.
Javid (Blackburn, Lancashire), June 2015