ESC B46 was introduced in 1995. Under this concession, HMRC agreed not to issue penalties for late filing of Company Tax returns or employers’ and contractors’ (Construction Industry Scheme) end-of-year returns, provided they were received by the last working day within seven days of the filing date.
For more information go to:
http://www.hmrc.gov.uk/briefs/company-tax/brief2410.htm