I visited the formation on Monday 16 Aug, but I am pretty sure it was already there on Sunday 15 Aug (and perhaps even before that). The formation looked messy, although parts of it looked pretty well. The formation is in the field above the field which contained the Basket in 1999.

I found the one at Roundway Hill nr Devizes. Its about 65-70ft across made up of small circles in a ring with a centre one and what looks like an arc coming from the centre ring to the outer ones, but only one arc in all. Position is between Roundway Hill and the A361.