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Here in Alberta this turns out to be a non-problem. What tends to happen is that the snow slides off the roof, stacks against the house. Within a day or so, heat from house melts a finger sized crevasse and the snow is no longer touching the house. Assuming that there is reasonable siding on the house this is a non-worry item IMHO. If however, the ground ...

"Deficient" render? That is a line of bull. Your use of damp proof course and render makes me think you are UK based. If so, you should have a guarantee of several years for the damp course work, and if so you should demand they fix the problem as they clearly missed a spot. Residual moisture? Don't make me laugh. They need to do fresh moisture measurements ...

Bridging the DPC is just asking for problems (IMHO). One possible solution might be: Apply "External Bellcast Bead" just above the DPC (this will form a drip edge). Apply "External Render Stop Bead" just below the DPC (this will allow you to render a plinth from just below external ground level, up to just below the DPC). Such a method doesn't bridge ...

Given that the water will only drain as low as the bottom of the drain pipe, you may have to put in a new drain pipe, or move the existing pipe so it's deeper. If you're lucky, it has a steep runoff angle so you may only need to replace/move a few feet of it to get it to a better depth. Beyond that, you can buy the gully hopper and build your own u trap, ...