From the acknowledgements section:
"We are greateful to Martin Weitz and the production team of 'Brain Man' (Focus Productions) for introducing us to DT as part of their science documentary. This work was supported by the MRC, UK."
I notice that Karen Ammond from the marketing and publicity firm KBC Media wasn't mentioned, even though she was apparently an Associate Producer of that documentary. She was also engaged by Daniel Tammet, the subject of that journal paper, to represent his interests, since 2001. Is this really a science documentary or is it just a bit of sciency showbiz? The borderlands between entertainment and science is a place that is full of problems.
It looks like the joke is on you, MRC, UK!
There is a similar acknowledgement in the other journal paper about Tammet by the Baron-Cohen team published in 2007, in the Journal of Consciousness Studies:
"We are grateful to Martin Weitz for introducing us to DT..."
Bor, D, Billington, J, Baron-Cohen, S. (2007) Savant memory for digits in a case of synaesthesia and Asperger syndrome is related to hyperactivity in the lateral prefrontal cortex. Neurocase. 2007 Oct;13(5):311-9.
[Unfortunately this revealing paper remains behind a paywall. Daniel Tammet is definitely the subject of this study, named “DT” in this paper. The fMRI study failed to find expected activity that would indicate synaesthesia, but did find activity consistent with the use of the memory technique known as “chunking”. Authors tried to explain findings with a claim that Tammet’s synaesthesia is a special type.]
Baron-Cohen S, Bor D, Billington J, Asher JE, Wheelwright S and Ashwin C. (2007) Savant Memory in a Man with Colour Form-Number Synaesthesia and Asperger Syndrome. Journal of Consciousness Studies. volume 14, number 9-10, September-October 2007, p. 237-251. http://www.imprint.co.uk/jcs_14_9-10.html http://www.autismresearchcentre.com/docs/papers/2007_BC_Savant_J%20Consc%20St.pdf ["DT", the subject of this study, is explicitly identified in the paper as Daniel Tammet]