First you need the parliamentary borders, which you can download as a shapefile from
You can also get the data generalised or clipped to the coastline - search for "Westminster" seems to get most of the options:
this shapefile loads into QGIS, and has a
pcon15cd column, which is the 2015 parliamentary constituency code, which starts with E14.
From the spreadsheet with E14 codes, save as a CSV and load into QGIS, which will appear as a layer with no geometry. Then use QGIS' JOIN too relate the data from the CSV to the polygons in the shapefile. You can then use a QGIS style setting to map the centroid points instead of the boundaries, and colour according to the linked value from the CSV.
There should be a few blogs on this process, or even in the QGIS documentation.
But quite quickly, and with a few "gotchas" (like stuff on the start and end of the spreadsheet), I produced this:
which is a point map of the centroids of electoral constituencies coloured by one of the variables in the fuel poverty spreadsheet.