As already mentioned the FREESAT box has no link to terrestrial transmitters and no need for an internet link (unless you choose to connect it thus).
What is far more likely in this case is the the FREESAT box was doing some dynamic reallocation of channels and got confused.
101 should be BBC1 for you selected (postcode) region. It is a re-allocation from the channel numbers in the 900+ series. These are often re-arranged - for example when one of the BBC regions upgrades to HD. This is when things may go wrong for your box.
Incidentally there are two ASTRA satellites up there at the same focus. ASTRA have in fact been playing musical chairs with the satellites at this focus for a few years now. Channels have been switching across between these satellites also. This is another reason why your box may get confused