I don't know the technicalities of swapping your boxes over sorry we don't have any tellies that are ready! but hang on a minute, this so annoys me about sky it's like paying to go into a shop to buy something. You are agreeing to pay an extra £10 a month to watch the HD channels, don't pay £60 for the privelidge! Whenever we have a problem with our sky box we ring them up and tell them to come and sort it! We rang up last year, said we wanted a sky+ or we would reduce our package, two weeks later the sky+ box was installed for free. Earlier this year a door to door person (I can't remember the company) offered me a great broadband and phone package, so I emailed sky, they phoned back and I got half price landline, which worked out better!
If you already have Sky+ (so have 2 cables from the satellite) and a phone socket nearby, I'd expect it to go fairly smoothly.
I don't have Sky, so don't know if they include an HDMI cable for you to plug between the box and your HD TV, but have you searched online in any UK web forum about installing Sky HD ?
Just that you might see a comment on needing to leave it for a few hours to update something (or get a code sent from Sky which causes the box to phone them back) or whatever...
Maybe when an engineer visits, he can dial them on some other number to get any codes sent out via the satellite while he is at customer's home, so it needs some of their tech support time (so the engineer probably gets a portion of the 60 quid).
Thanks everyone, we're going to try and push them to fit it for free but good to know that others have done it. I did buy an extra Hdmi cable when we bought our tv and we already have sky plus so should already have the cables.
We've had loads of problems with our Sky over the years and had to threaten to leave on more than one occasion so sympathies with others who've had problems. It's ridiculous that there's no rewards for loyalty - just incentives for new customers!
We have just had Sky+ HD added where we only had normal Sky before, the dish is the same, cables are the same, the only difference is the Sky+ box plugs into the TV with an HDMI cable now and you've got that so it should be OK I reckon.
We called them 4 times and each time they tried to sort it their end until they conceded defeat, after install one 1 input registered, it didn't matter which cable was attached on,y input 1 had a signal, so no recording etc.
Lesson, call and call and call then a free install.