Continental presented its estimation that the UK car, 4×4 and van tyre market remains worth around 33 million tyres at the launch of its partnership tyre supply deal with Mercedes-Benz World, a performance demonstration facility on the historical site of the Brooklands circuit. This number is similar to 2011, though Conti noted several trends affecting the make-up of this figure in 2012, most notably the growth in part worn tyre sales, estimated to represent just under 10 per cent of the total market. Initial signs of the impact of tyre labelling, introduced as a mandatory measure in November, are minimal, with premium segment sales holding up. Conti calls any current definitive assessment too early to truly assess, however premium tyre sales have held up well. Meanwhile the quality segment has come under pressure from aggressive pricing on either side, with brands in this segment struggling to maintain share, according to Conti.