http://cdn.f1i.com/wp-content/uploads/2 ... a_5_FR.jpg
Interesting nugget of info there, the MGUK is "PH1.0" or Phase 1.0. Phase 1.0 will be the very first iteration of the 2016 design and shows that Merc' have not needed to make any changes to that design since (likely) late 2015, not even after initial dyno testing or winter track testing.
Thats a pretty amazing example of "right first time", I know Merc have had their reliability issues this year but that still a sign of how good the design team are. I'd love to see what Phase the MGUH is on, at a guess probably something like PH2.5 after the issues they had in the early season.