Channels Missing on Windows Media Centre Freesat
Default TV Signal Setup often misses many channels available on UK freesat.
If only couple of channels are missing, you can use Single Transponder Scan to scan a particular transponder for your missing channel:
Tasks > Settings > TV > TV Signal > Satellite Transponder Scan > Single Transponder Scan
Provide transponder details for your channel and click Next. Media Centre will find and automatically add all channels available on this particular transponder.
You can find transponder details for your missing channels online. For example, this Wikipedia article lists all 28°E free to view channels. All details you need are in frequency column.