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The Vision of Britain has Ecclesiastical Parish boundaries but I can't see them listed on the data download page. It may be worth contacting the project to see if they can supply them. Or you could consider using Civil Parishes as @Mapperz suggests. In both cases I think the issue will be that Britain is not completely covered in parishes.


I assume the GeoTiff is in WGS84 EPSG:4326 with degrees as units. As you may know, degrees of latitude and degrees of longitude have different lengths if you are away from the equator. What you expect to see is a projected CRS, like Web Mercator EPSG:3857 or the UTM zone of your part of the world. In QGIS, you can set the project CRS to change the view ...


If the dataset was geocoded automatically by the upload, it was geocoded by your city column but not by the address. CartoDB, unless disabled in the Connect Dataset section, tries to guess automatically the types of the columns and also tries to get a column for which the dataset could be geocoded by Country name, City name or IP address. Probably CartoDB ...


You can set up spatial bookmarks. This will allow them to view the data at the exact zoom and location that they want. This should help: http://resources.arcgis.com/en/help/main/10.1/index.html#//00660000043s000000


If the file is a tif, you can add transparency to it, either by adding a transparency channel, or with additional NODATA values. For the first solution, you might clip your data by a polygon layer of the red line. For the second solution, you can use the information tool on the raster layer, note the raster value in the black and white areas you want ...

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