Have you had a chance to have a look at the DIY Projects area: https://www.diydoctor.org.uk/projects.htm There are several projects relating to Central Heating and Radiators that may be of some help to you.
DIY how to tutorial projects and guides - Did you know we have a DIY Projects section? Well, if no, then we certainly do! Within this area of our site have literally hundreds of how-to guides and tutorials that cover a huge range of home improvement tasks. Each page also comes with pictures and a video to make completing those jobs even easier!