TV channel MORE4 has an interesting series on Monday evenings at 9pm.

I watched the Bentley programme and thought it very interesting.

Link below to episode guide, there only seems to be 3 although I thought it was a larger series.

https://www.channel4.com/programmes/how-to-build/episode-guide FL2 XS SD4 Auto 2010 2012-2017 (21k - 91k miles) (MY2011)
FL2 Metropolis SD4 Auto 2014 2017- (16k - 76k+ miles) (MY2015)