He won by almost seven seconds from Mercedes teammate Nio Rosberg who was demoted to third, behind Red Bull's Max Verstappen, for breaking rules over taking technical team advice on his radio to deal with a defective seventh gear.
In the drivers standing, Nico Rosberg leads with 168 points, just 1 ahead of Hamilton's 167. On lap 46, Rosberg developed gearbox problems, and the team instructed him to switch from sixth to eighth gear, thus avoiding seventh.
The FIA race stewards, represented by Nigel Mansell, Tim Mayer, Nish Shetty and Dennis Carter, punished Rosberg with a post-race 10-second time penalty which dropped him behind Max Verstappen and into third place.
From there, he never looked back, and despite running off the road at turn one, he ultimately cruised to his fourth victory in five races.
Hamilton led every lap of a race that started under the safety vehicle in wet conditions but dried.
Lewis Hamilton celebrates at Silverstone.
"However, the Stewards determined that the team then went further and gave instructions to the driver that were not permitted under the Technical Directive and were in Breach of Art. 27.1 of the Sporting Regulations, that the driver must drive the vehicle unaided".
"I put the trophy down, and I could see the crowd and I just wanted to connect with them in some way".
"But I really feel that since that low after Barcelona [where Hamilton and Rosberg crashed out on the first lap], I was able to cultivate a very positive and strong mental attitude, and that's what I have today".
"Unfortunately Nico got past but then we still had great pace, I could still see the top two so at the end I have to say thank you to Red Bull for giving me such a great auto, I think they deserve a lot of credit here". The Dutch youngster ran an impressive race, even challenging Rosberg at the midway point with a brilliant pass at Becketts, though the German reclaimed the position shortly after.
Only Alain Prost has won more times at Silverstone than Hamilton, and only Prost and Jim Clark have won more times in Britain as a whole.
On the first racing lap after the safety vehicle had withdrawn, Hamilton surged into a lead of 3.6 seconds.