Road sign reads: "I am not in the office..."

English officials in Swansea on the UK's west coast needed to put up a sign to divert heavy traffic away from a residential area, the text was No entry for heavy goods vehicles. Residential site only. When they asked for a translation in Welsh, the response by email was Nid wyf yn y swyddfa ar hyn o bryd. Anfonwch unrhyw waith i'w gyfieithu.
They took the answer for granted without proofing and the sign was printed.
