Hi there
Make sure you have suitable laminate flooring for 'wet' areas like the bathroom, or to a lesser extent a kitchen, or else it will look good for a few months but then you will start to get problems as the water gets into it!
As for the finish, you would really be better putting it under the WC and pedestal; you could alter the plumbing to 'reach', but granted it may need a plumber (or a competent DIY friend if you are not confident). In my opinion, with limited tools and skills it would probably be harder to get a neat finish if you are going to try to cut the flooring and shape it around the items above. Concerning the radiator pipes you would usually cut a 'slot' from the board edge to where the pipe will pass through. You can then cut a small piece to fill the gap behind the pipe once fitted. Alternatively, you can drill a bigger hole than the pipe diameter (big enough to pass the pipe through), and then to cover the gap with a pipe shroud, which come in various finishes. You can also get sleeves to cover the rad pipes. Trouble with this is you will need to remove the connections to the rad and possibly the rad itself, which will require draining part, f not all of your heating system.
Also remember that you may need to lay an 'underlay', sort of a thin foam material before the laminate, and that you will need to leave a gap around the edge in accordance with the laminate manufacturers specification.
Vinyl flooring would be easier, but still tricky for a novice DIYer to get a neat finish round the edges....it is harder than you would think! Good luck whatever you choose though!
