Aerospace and Defense in London

What are the top players in Aerospace and Defense in London? I'm well aware of Jefferies Quarterdeck, but can't find much information about other groups in the UK. I'm guessing this specific niche is relegated to Industrials groups? I see Deloitte and Houlihan Lokey have committed A&D groups in the US, but no presense in the UK?

I'm a US military veteran, and am hoping my background in military aviation, along with forthcoming finance degree and CFA level I, will give me an advantage in opening some doors in the A&D sector of IB. I'm most interested in this specific niche of the business world, which will help psychologically when working so many hours! I'm specifically looking to work in London as it's by far my favorite city.

Any advice would be greatly appreciated.