the patio should be 150mm below the dpc, if its not, then you need to install a linear drainage system against the wall, As for the manhole cover, if its the rectangle metal type, then you can move it over and lay a concrete lintol on the brickwork to span the gap, or buy a smaller cover.
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!