Therefore - firstly, I am aware that there is an increased risk of dust when putting the PC on the floor beside the desk. If I did this, I'd probably buy a stand like http://www.amazon.co.uk/KOENIG-Wheels-Mobile-Secure-Computer/dp/B000SAJK1M/ref=cm_cr_pr_product_top to try and keep it slightly raised and prevent it being straight on the carpet - would this improve the situation?
The second issue is that currently the only space for the PC (it's a small flat) and desk ends up with the PC being in front of a radiator - there is a gap of 4-6 inches between the back of the PC and the radiator, so it's not pressed up against it, but I'm concerned about overheating when the radiator is on in the winter.
Is this therefore a viable place to put the computer?
In terms of cooling etc. - as mentioned, the case is a Zalman Z11 [High Performance], and it has an 'Akasa Nero 3 Ultra Quiet CPU Cooler'. Can provide other specs if needed.