Probably catering, I saw the BBC at work near where I used to work.
More seriously, there are some details (but no costs) of the project here, http://www.earthmoversmagazine.co.uk/jcb-team-helps-engineer-ww1-tank-centenary-tribute/ No doubt the actual figure is in JCB's promotions budget.
jh
-- Edited by jch_in_uk on Tuesday 13th of November 2018 11:55:24 AM
It's cost would have been worked out exactly, before the program was commissioned. DVDs are a normal part of the making of programs these days. The program was made by North One Television. Just take a look at their other programs. https://www.imdb.com/search/title?companies=co0123995