All in all so far:
I was able to source 3x ds-2cd2142fwd-is and 1x ds-2cd2142fwd-i, they are used with one dead IR, but for £135 for four, I will not complain, that's £33.75 per camera, 3x 2.8mm 1x 4mm
Need be I can always add external ir, but one side of the property is lit from street lighting, we shall see
There is another guy getting rid of another 15 used cameras, but he seems to stick firmly to his £50 per camera price, they are all 4MP hikvisions, domes and couple bullets, thing is the 4MP Hiwatch bullets are £45 brand new from one company, the only downside is there is no SD port, but otherwise id imagine it be the same quality image/camera
Not sure whether I will be needing NVR yet, I have two IP-COM poe switches, I would ideally also not have all cameras wired directly to nvr, or blue iris station for that matter.
Will keep updated