The MSA (Motor Sports Association) released the 2016 list of approved tyres for competition.
In 2015, the EU changed the law to stop G rated tyres from being manufactured. The current 2015 list of tyres for those in Road Going classes can be found in the Blue Book. There are two lists - List 1A and List 1B.
The MSA's latest publication has moved some 2015 tyres into a new list called List 1C.
You will need to look carefully at any championship regulations which you need to comply with in the 2016 season.
Our understanding is that the Gurston Championship is likely to accept tyres ONLY tyres 1A and 1B but this is not yet comfirmed.
Here is the press release and list download link.