I’m currently looking into this as well. I looked at the Swann gear, and from trawling cctv forums, it seems you can do better price wise for the same specs.
There’s a decent 4 channel 720p camera setup on Amazon which looks like a winner:
ANNKE 4CH 720P PoE NVR HD 1280*720P CCTV Camera System and 1TB HDD w/ 4 Weatherproof Superior Night Vision HD 720P Security Cameras System (HDMI Output, 1 Megapixels Hi-Resolution, Vandalproof/Weatherproof Metal Housing, P2P Technology/E-Cloud Service, Smartphone QR Code Scan Quick Access, PC Easy Remote Access)
https://www.amazon.co.uk/dp/B00NZWIZYS/ref=cm_sw_r_awd_a-xzvb0QRARH7
Its ONVIF compliant, and uses power over Ethernet cabling. This means you don’t have to use the supplied recorder to access the cameras, but can use your home PC network, with whatever software you choose.
The PoE cabling is a nice touch.
Other than that, I’m looking into individual 1080p PoE cameras from a company called Hikvision. They are about £90 each, but come highly recommend.