Thanks all for the thoughts so far.
UnderAnOpenSky Fez909, do you make many video calls? Is quality consistently high?
I'm also interested in what might be a reliable and reasonably fast solution for connecting my laptop to wifi on the move. In the past I've used the hotspot on my phone, when I was with 3 – generally worked well, but definitely not 100% reliable.
Here in Japan, I've got a Wimax pocket wifi thingy, which typically gets around 20mbps down and 5 mbps up – so not super-fast, but it seems more stable than using a phone hotspot. Is there something like that in the UK?