Central heating layout. This should work, right?

[GreyBana]

Thanks, I really appreciate the advice and pragmatism. I absolutely agree about explaining the correct way to do things and I'll definitely give it a good go trying to move it about within the constraints I have! If it does start looking like I'll have to moving things around on a larger scale, I'll leave it as it is and sort it out when the boiler inevitably pops.

Honestly, thanks for taking the time to go through this with me, it's been really helpful!