Went to get the Haibike out of the shed this morning only to find the rear wheel flat. It's a bleedin' Slime tube an'all. Luckily, I've got a set of spare wheels, so I've swapped them over without too much swearing. In so doing, I noticed that I've put the front tyre on in the wrong direction. That's not a task for this evening.
I've never fixed a puncture on a Slime tube. I foresee trouble finding the leak unless it's mahoosive.