Went with the UNV 4 camera setup with the hybrid DVR. In all honestly, it does leave a lot to be desired but is still more than adequate for the intended purpose.
They seem to have good reviews on youtube. They have just released a new model with AI human/person detection, which is £80-90 more. I decided I would stick with the RLK8-800d4, I can swap out the the cameras for the upgraded ones down the line if I want.
I'm quite impressed by the software so far, next thing I have to do is run the cabling which I am dreading a bit, I think if I can get some floorboards up I should have enough access to to feed rods through to where I need them (assuming there are no walls in the way!)
I may post a small review once it's al up and running.
If it is also POE then you at least only need to wire the network cable, my new camera are POE so while not a big deal as it is mounted on my balcony door, then it is still nice.