Re: Speed of light
The speed of light is defined (!) to be exactly 299792458 m/s because the meter and the second are defined quantities.
That said, the British are probably going to enjoy this increased speed in short time, in contrast to the usual slight speed reduction caused by air. The British isles are already known for low pressure coming from the west. Then at brexit time, the EU will turn off the flow of air too, reducing the air pressure considerably and speeding up any radio signals in the process.
BTW, you know what happens, every time a politician creates a pocket of high pressure air? Well, the speed of light through that medium is reduced, which means time slows down! Therefore, politicians can never reach their full potential; the more they try, the slower they get.