I finally managed to open an account with the German company IPcopter who run the ground station, so I can use the Alden satellite system. It’s not that expensive if you buy a full year of connectivity upfront, although quite restrictive on bandwidth, so I won’t be using youtube or even email on it.
It’s proven difficult to get connected a couple of times, but the guys who do tech support managed to lead me over the phone to get a connection. It seems very susceptible to wind though, far more than I would have thought. However it’s fast enough once connected so I’ll stick with it and see how it goes.