It might have been for a home made bomb. The inner tubes of bicycle tires were cut and filled with plastic explosive. If you laid them on the wing root of a plane and detonated them they would take the wing straight off. So maybe thats what your bit of pipe was intended for.
Comments made by Will Ward. He is right about the gas mask filter box.
How about the last few photos being the bottom of an army issue gas mask filter box – the metal type seen in attached http://www.nzmuseums.co.nz/account/3015/object/476/Gas_Mask (struggled to find a really good picture, but I think they are carbon filled to provide absorptive filtering and had vents at the bottom side edges.
The Bakelite (I presume) round thing with 7 connectors is a distributor cap (from a 6 cylinder engine). Significant in an Aux Unit setting as this is what you remove to immobilise a vehicle during the war.