"I accept that 50% of the tax is a harsh penalty where the offending does not involve dishonest behaviour. The offending is to persist (without good reason) in the position that the taxpayer’s tax liability is lower than a final judicial ruling in a similar case has indicated that it is. The prejudice to HMRC that it is put to the trouble and expense of defending the appeal 9 which, because there is no good reason for the persistence, HMRC considers that it should not have been."