Thanks Mark12.

ZK-ADV is in fact a non-flying replica of the one and only Tui Sport, which was a local design based somewhat on the Lincoln Sport but different.

I guess that S/Ldr Addams may well have worked with Arthur Marsden OBE, who had a key role in the purchase of US and Canadian-sourced aircraft for Britain. You can read about him here on my website:
http://www.cambridgeairforce.org.nz/Albert_Marsden.html

From the BBC Genome site:

BBC2 7 September 1980, 20.45hrs (Repeated, BBC1 – 9 November 1980, 15.35hrs and then BBC1 4 August 1983, 15.30hrs)

Missing

An Inside Story documentary
On 7 September 1940 Hurricanes of 257 Squadron took off from Martlesham Heath , Suffolk, to intercept a large wave of enemy bombers over the Thames estuary, heading towards London on what turned out to be the first day of the London Blitz. Among those lost in the battle was Flt-Lt H. R. A. Beresford. No one saw him shot down. He was posted as ‘ missing ‘ until September 1979 when the wreckage of a fighter was found … This documentary pieces together the sad story of Beresford’s last mission, finally concluded 40 years after the Battle of Britain.
An outstanding programme of the weekend … last night’s haunting, perceptive and eye-opening Inside Story.
(THE DAILY TELEGRAPH)
The film built impressively into an attack on the ‘ bogus romantic cult’ of the fighter pilot. (SUNDAY TIMES)
Producer ROGER MILLS Director PETER GORDON