I agree, I think it came lose from the bed too - wanted to get other peoples opinion first before I said so incase i had people thinking down the wrong track.
Thanks for the tip on the isopropyl, we have heaps of that around so will be no problem. I couldn't find the blue tape that came with the ultimaker so bought two different brands of stuff at the local hardware store that look similar, they are a bit smoother than the stock tape though which I haven't found here yet.
The very tip of the fin does lick up a little bit, but nowhere near enough for the printer to hit. I have a heated bed from last time I was using the printer, but I need to get everything working without it first.
unfortunately, if this is going supersonic I need accuracy so parts fit together with no gap, and I need the layers to be strongly bonded. This is a prototype for something much bigger.