Windows PC with DVB-T(2) receiver(s)

[bottletop]

I haven't used this for a long while and was pleasantly surprised to see it again recently.

TV Scheduler Pro

Download TV Scheduler Pro for free. TV Scheduling service that allows timed captures of Digital TV to your hard drive using a digital tuner device. (DVB-T BDA)

sourceforge.net

Pros

• lightweight recording server
• great interface and excellent EPG
• easy timer/schedule settings
• recordings are not encrypted
• power saving options
• (not tried it recently, but I recall it was able to record a mux rather than just the program stream)
• uses Windows

Cons

• requires another program/client to watch recording
• may need to process the recordings before HD(R) Fox T2 will play them
• uses Windows
• uses xmltv for the EPG (maybe that's why I stopped using it, it use to retrieve the Freeview EPG)

So you can use a small low power Windows device (eg old NUC/etc) to do recordings, and other device(s)/clients (eg Firestick/HD(R) Fox T2/Smart TV/etc) for watching.
If the PC is not too old, then it may double up as the viewing device as well.