Thank you for all the responses; we realise we're not the first to be in this situation, nor will we be the last.
Skype has been a great help over the last few years. We haven't been homesick that often, mainly around Christmas, but it has helped us connect with our families and friends so that we can see that they are well (and vice versa). We're sure we'll be using the programme even more so when my lovely wife is expecting, just to keep everyone up to date and so the parents can feel part of what is going on.
Andy