Oh dear, the silly tyre rules are spreading...
http://www.btcc.net/html/generalnews_detail.php?id=3253
The BTCC rules are already quite contrived and championsips and races have been very close for the last few years so I don't understand why they feel the need to introduce another artificial element.The Dunlop MSA British Touring Car Championship has introduced a significant change to its tyre regulations for 2013.
At nine of the championship’s ten events (the exception being Thruxton), drivers in the latest NGTC-specification cars will have one set of a new ‘soft compound’ Dunlop tyres at their disposal, which will offer superior performance to the standard compound tyre.
These tyres must be used in one of the three races at each event and drivers must nominate, prior to Saturday's qualifying session, which particular race they elect to use them in. However, they cannot be used for qualifying.
Other teams and drivers won’t know in which race their competitors have chosen to use the soft compound tyres until the cars go to the grid; the tyres will have a special marking to make them easily identifiable for rivals as well as trackside spectators and TV audiences.
http://www.btcc.net/html/generalnews_detail.php?id=3253