Ban for drug cheats doubled! The minimum ban has been raised from two to four years. And there will be various punishments for missing test as the leniency in these cases will be reduced.
UK sports minister Helen Grant said the changes would "better protect clean athletes around the world".
"Successful implementation will mean an innovative and robust anti-doping programme that reaches further than ever before, to more athletes, more support personnel and more sport lovers, all of who want to be part of sport free from doping," she added in a statement via UK Anti-Doping.
"We will see tougher sanctions - not just for athletes, but also for those who assist in the doping process."
Wada said the 2015 code had more incentive for anyone providing "substantial assistance" in uncovering doping.
"Admitting a violation can be rewarded with a reduced ban, with Wada having the final say. In exceptional cases, Wada has the power to eliminate a ban entirely and offer complete confidentiality for substantial assistance," it said.
The revised code was agreed by the World Anti-Doping Agency (Wada) in November after over 18 months of research by the governing body.
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