Trundler,
Simple! just call it solo and nobody will question you whether you were supported or not. That way you avoid too fine a terminology. When I soloed the Ramsay clockwise I picked up one lot of food I had left at Fercit and Martin Stone (who is one of very few who have done unsupported challenges) made it clear to me that my Ramsay was 'supported'. I totally agree with this.
Yiannis