Yep to give the pilot a better view over the nose.
The first example of the "Long Nose" Blenheim had a full enclosure like the HEIII. (See lower image below)There were visibility issues with this. The next design had a symmetrical type arrangement to the nose panels (See upper mockup image). This too had over the nose pilot visibilty issues. The solution was to scallop the section immediately in front of the pilot thus giving him a better over the nose view/sightline.
Strangely the Blenheims ultimate derivative the Beaufort had symmetrical nose panels. The Blenheim V had a solid section here as well.