I’m a Sky Engineer and don’t trust anything the callcentre staff tell you,
We get f3cked over by them all the time.
On a more positive note,If you cancel the HD subscription but retain your standard subscription ie.Variety or Knowledge packs etc,
then you will still have all the Free to View HD channels, which should be BBC HD,BBC One HD,ITV One HD,Channel 4HD,Channel 5HD,Luxury Life HD,and NHK world HD.
As long as you retain a subscription of some sort you will retain the recording facility.
If you have had the box for over 12months then in theory you can cancel all your subscription and retain the box to use as a freesat box,however the recording facility would then be disabled(Including the ability to view stuff you have previously recorded) unless you pay £10 a month purely to enable the recording function.
Also be aware that in Sep they are going to change all the packages.
They are supposedly going to combine and simplify the packages into 2,entertainment & entertainment extra.
Most people should gain extra channels for no extra cost.
Hope that helps