Mr Cameron, on a trade visit to India, said Westland was an "excellent company".
Wildcats are built at nearby Agusta Westland in Yeovil, about seven miles from the naval base.
The claims, which are denied, concern the supply of helicopters built at Westland's factory at Yeovil, in Somerset.
It later became clear Sir Leon had put pressure on BAe to leave a European consortium bidding for Westland.
In September 1985, in a government reshuffle, Sir Leon was made trade and industry secretary and within months, the Westland affair hit the headlines.
He said the issue of whether bribes were paid to win a contract was a matter for India and Westland's owner, the Italian company Finmeccanica.
He had to handle the Commons at a time when there were some highly contentious issues about, including the miners' strike of 1984-5 and the Westland affair of 1986.
Two specially-modified Westland-Wallace bi-planes with open cockpits were used for the feat, taking off from an airstrip in northern India to fly into the Himalayas over the 29, 000ft (8, 848m) summit.
Leading European companies (including Aerospatiale, Westland, and MBB) have teamed together to form an organization called Eurofar for the purpose of developing and marketing a tiltrotor aircraft for commercial and military markets.
Back in 2007, Mr. Stern was sued in civil court along with his business associate Ephraim Frenkel and First Republic Realty Group by Westland Industries, a California financing company, over the shopping-mall deal.
The affair, over the future of the troubled Westland company and whether it would link up with an American or European company, led to the resignation of both the then Defence Secretary, Michael Heseltine, and Sir Leon.
In my mind, this seems a little odd, purely because you'd have thought he'd be pushing to deliver a new vehicle rather than get involved in the messy process of dealing with another company's (Westland at the time) hardware.
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That was followed by the revelation he had authorised the leaking of the solicitor general's letter to Mr Heseltine, in which the former defence secretary was warned of a material inaccuracy in a letter he had sent to a merchant bank about Westland.
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