coolant leakage from header tank overflow

[dave.38]

started up my 06 tiger after it had been laid up for a bit and thought would give it a run,  left it standing till it got up to temp and the fans kicked in, engine cooled ok then switched engine off  went back in to the house for a minute  when i came back out all the rubber hoses had been sucked flat and there was coolant on the floor just infront of the back wheel wich i assume came from the headertank overflow,headertank is now  empty, anyone else had this problem or know solution                
                                                          dave

[blacktiger]

What, if anything, was the last bit of maintenance done to it?

[dave.38]

What, if anything, was the last bit of maintenance done to it?

[iansoady]

"Post subject: full service history by triumph dealer"

There's the problem.