If you are going to get anything done, it may be worth considering getting a different LNB unit (some have 2 LNBs, but you can get 4 or 8 LNBs in the unit for the end of the stick, allowing between 4 and 8 boxes()) so you could add FreeSat boxes in other rooms. Add sufficient cable to go to the other side of the house (through the loft) and down the other side, and pretty much any room could have a relatively cheap FreeSat box for general viewing, just not all the Sky options.
It's worth doing while you're getting the dish checked (and the Sky guy might be willing to do it at the same time, for a few quid extra, cash in hand, so long as it won't delay him too long - and let's face it, plugging in some extra cables and pushing the length into the loft won't really take much time...
Just don't expect them to climb up in your loft when it is likely to be sweltering up there!
When I had Sky installed in Feb 2012, I asked about changing to an 8 LNB unit and the guy wrote his own mobile number on the paperwork so I could give him a call for a private job. I was later given a long length of dual core sat cable (like the figure-of-8 used by Sky) so got a ladder and did it myself.
Two months later I saw a deal from Tesco where I could buy a FreeSat box and they'd fit a satellite dish free, so some guys drove from Rotherham to Merseyside and fitted the dish on the side of the house (in the alley between my home and the neighbours) and the cable went into the back of the house. I'm looking forward to TV Licencing getting a warrant to search and find that all my cables go to FreeSat boxes with World Radio Network (only) and no TV pictures possible at all !!
() 4 if you are using satellite boxes which can record - they use 1 for viewing/recording and 1 for recording - 8 would allow up to 8 boxes with no recording option.