Hi Nohras Lad,
Howard & Bulloughs is the correct name. My Grandfather worked there from approx. 1910 until approx. 1950. He was the supervisor in the moulding shop. His name was Albert (Dick) Swain.
I do know that during the war years they produced Aircraft Parts for various aircraft manufacturers, but never whole aircrafts.
What I can tell you about the Wellington Bomber is as follows:
It was designed and produced by Vickers Aircraft Company, but with the event of the second world war coming, more and more aircraft were demanded. This meant that other factories (so called Shadow Factories) such as, Gloster Aircraft Co. and Armstrong Whitworth Aircraft, were also producing the aircraft. See link below for more information.
https://en.wikipedia.org/wiki/Vickers_Wellington
A small anecdote:
I served my apprenticeship at the English Electric in Clayton-le-Moors from 1958 until 1963. At the beginning we were still producing the Canberra Bomber, later the Lightning and at the end the prototype(s) of the TSR (another sad story).
My departmental head in the Spar Milling dept. was Bill Leeming, who told me that during the war so and so many parts and aircraft were being produced per day (or week not sure now) which to me was a fantastic amount. I've forgotten which type of aircraft he meant, but with the information above on "Shadow Factories" it could well have been Wellingtons.
Not forgetting that there were "Work Buses" bringing employees to and from the Factory from all over the area.
Cheers
Philip Kenyon
Late Belfield Road