s 121 Compliance with procedure
The following shall be inserted after section 31A(3) of the Immigration Act 1971 (procedural requirements for application)— (3A) Regulations under this section may provide that a failure to comply with a specified requirement of the regulations— (a) invalidates an application, (b) does not invalidate an application, or (c) invalidates an application in specified circumstances (which may be described wholly or partly by reference to action by the applicant, the Secretary of State, an immigration officer or another person).