thanks to all the responders.
I was looking to avoid the use of a mobile phone for data/web access if at all possible. I only use a pay as you go phone and my ANNUAL bill for it is less than many people pay out on their contracts each month. I am concerned that the cost of data/web access when abroad (mainly France) will be disproportionately high. The size and weight of any solution must be kept low (2 people touring in a microlight doesn't allow much luggage space or weight) and the security aspect means carrying all of your toys when you leave the aircraft (pocket sized stuff is good).
The cheapest solution may be a text message to someone at home who is able to work the internet and reply. No PC to get pinched.