[The race controller]

The 2010 handbook says:-
23.11 At Sanctioned events two types of control
tyre will be adopted for the rear axle of both
2WD and 4WD cars. The choice of tyres for the
front axle will be free, subject to conforming to
rule 23.7. The Section committee will approve
the choice of control tyres. The make and type
of the control tyres to be used at National events
will be specified on the National Championship
entry form and also in the confirmation document. There will be no restriction on the number or compound of tyres used.
23.12 The use of sensors fitted

As far as I remember the Northern league has never done this.
The reason being different tracks used different tyres and the local model shops catered for their nearest track.

The Surface of our new track is not what I call AstroTurf, it's more like Brillo Pad (Pan scourer), so the normal tyres may not work.