Television and movie producers currently have a good deal in Great Britain, not in small part due to stability in various markets and some funding. For example, Game of Thrones, an HBO production, is filmed in Norther Ireland with funding from the European Regional Development fund.

Both the stability and some of the funding for various productions is now at risk because of the Xenophobic whiny baby Leavers.

This may be on the smaller end of negative effects of the UK leaving the EU, but it is a microcosm of the bigger problem, and likely to get a disproportionate share of attention if The Doctor has to run, or Residue gets tossed in the trash, or other programs lose funding or find themselves operating in an environment of uncertainty.