Channel 4 is definitely not considered fact based or center left; it's really very left wing indeed and is about as "fact based" as as the rest of the media (i.e. not very).
It's very telling that the top two most popular videos on Channel 4 News' YouTube channel are:
1. A weather man correctly pronouncing the name of the Welsh town of Llanfairpwllgwyngyllgogerychwyrndrobwllllantysiliogogogoch
2. Jordan Peterson being interviewed by a C4 journalist. After it was uploaded it was described by one pundit as the most disastrous interview for the interviewer they'd ever seen. It has nearly 40 million views, mostly because the interviewer is so absurdly ideologically biased against Peterson and is clearly trying to paint him as absolute evil, yet he handles it (relatively) so well. At one point the interviewer actually becomes so confused she literally runs out of words and doesn't know what to say, leading Peterson to say, "hah, I gotcha" and she replies "yes, yes you have got me".
