The Formula 1 development race has entered a strange phase as we approach the summer break, with teams trying to balance continuing development on their current cars against working on the big rule changes coming for 2017.

A grand prix and post-race test at aero-dependent Silverstone offered plenty of hints at various teams' approaches, so here's a round-up of who is working on what at a time when everyone's resources are being pushed to the limits.

MERCEDES

Aero and ERS cooling in focus