TCL C645 as said sits below the C745 and is priced at £380 for the 50 inch and £430 for the 55 inch. The C645 is an Android TV the same as the Phillips the One, whereas the C745 is a google TV and uses a 60hz like the rest on your list (but is capable of interpolation 120hz) panel (The C745 uses a 144hz panel). The brightness is more akin to the LG’s of 450 nits.
https://www.techweekmag.com/reviews/tv/tcl-c645-review/#google_vignette