Wideband LNBs are for the latest freesat models (which all include “4K” in their name) and Sky Q. They enable recording and watching of more than 2 channels using just 1 box.
For other (older) boxes, including your HDR-1000S, they need either a non-wideband LNB, or a hybrid LNB.
The non-wideband non-hybrid LNBs are cheapest, but if you are likely to stay in your new flat then installing a hybrid will enable you to have more choice of a replacement recorder when the HDR-1000S ceases to function, without having to change the LNB yet again.
There are convertors that can convert the wideband signal from the LNB to the older type but reports online where people have replacing their LNB are a lot easier to find.