On a cross-country flight and over North Yorkshire, ran out of lift and ideas. Chose to land at the ex RAF Melbourne airfield and whilst flying a conventional circuit remembered that it was now a drag racing strip. The only bit of runway I could have used had 'stuff' all over it which turned out to be mostly traffic cones. So landed to the side on an area of grass that had recently been cut - no problems. Along comes a chap in a 4X4 pick-up who had a face like thunder telling me I was the seventh glider to land that afternoon and he was p****d off with us all. He said that they had all moved his traffic cones to allow a tug to land and take off with the retrieves. 'And, he thundered, none of them put the bl**dy cones back'!!! I explained that I wouldn't need to move the cones as I'd got someone coming with a trailer to take my glider away.