Hi Phil, thanks for the update.
We're back out on Feb 28th. The Sky box is already plugged in and connected to the wall socket. Will try again and report back afterwards.
I emailed the call centre today about the TV - they do think it will be before April when the TV is ready. I only asked them about using our own boxes for the 30 Euro one-off payment, but they didn't mention that at all. Their reply was just about the 400 Euro option of buying their own decoder. So I've emailed them back again to try and find out if we will still be able to use our own boxes.
Chris