Thanks again guys. My computer, DV and jacket have always gone in the hold and I have never had any problems I have to say.
Then again the number of times they have been "exposed" to low pressure is relatively few so it is reassuring to know you guys who do it for a living have had no problems over the years. My new dive computer is not exactly the cheapest bit if kit and easily comes out of the octpus so it is good to be reassured it is not worth bothering. Oh well, it is insured as well.
I will keep the notebook with me as I have always done.