Learnt my lesson. I went away for 2 nights, leaving early on the lst day and home late on the 3rd. Yes I took 3 cannulas with me (was due a change the middle day) and an extra reservoir plus back up pens/cartridges etc. So whatever happened I would be OK, but I am glad I did take extra stuff. What I forgot was my inserter. So very late on Friday night I was running out of insulin, so I changed the pump, inserting the cannula by hand. At 3 am I had an occlusion, but I primed the pump and insulin was dripping out. Went back to sleep, woke with 17.6 Eeek... Carefully inserted a new cannula... and BGs steadily dropped back to normal with several corrections. I left the original cannula in "just in case" (of what I am now unsure). When I got home I took the original cannula out, to discover it was bent at right angles!
Good thing I had the spares.