I too had one of these calls - the number was not withheld when I called 1471 it came up as 07884 895631.
Claimed to be the Environmental Care Agency and they were "asked to call me by the government". When I asked who in the government had asked them to call me he said he didn't know. The call ended shortly after this.
Clearly a scam.
Comment by Not That Gullible on 05 Nov 2014