You can use willobuild or grogbuild free-range to flash latest image and add build.
As for subscription it depends what you can receive.
Limited none sky channels on sky UK via sky UK on cams although what's available is unstable
Virgin UK/Ireland hasn't worked for a few years.
You can use free satellite or terrestrial channels
If you have options for motorized dish you can get various foreign channels and some with English commentary. I don't use multi sats so others maybe able to advise on this setup.
You can use IPTV if you're provider supports setup on enigma2.
Just a note newer codecs don't work on old boxes so arm 4k boxes are recommended for IPTV for less issues