Can you identify this building to win a £25 drinks voucher?

This unusual building resembles a spiral-formed salad bowl. But what is it really?

Email your answer to First correct answer wins. The editor’s decision is final. No cash alternatives will be offered. No employees of CMP Information or their relations may enter.

The building on 17 October was RMC HQ in Thorpe Park, Surrey, designed by Edward Cullinan Partners and completed in 1990. The winner was Rob Lewis of Cornish Architects.

RMC HQ in Thorpe Park, Surrey