There is a standard penalty provided for in FA 2008, Sch. 36, para. 37. This is charged if a person:-
The standard penalty is £300. A notification of a Tribunal-approved inspection or for the production of documents warns the taxpayer that a penalty will be charged for failing to comply. If they obstruct a tribunal-approved inspection or destroy documents required by a notice, therefore, the penalty will be charged automatically. Otherwise, they will be given 14 days’ notice of the penalty if their failure continues.
The taxpayer has a defence of reasonable excuse for their failure or obstruction.