No solicitor shall be liable to have his name struck off the roll on account of any failure to comply with the requirements with respect to persons seeking admission as solicitors of any training regulations or on account of any defect in his admission and enrolment, unless—
(a) the application to strike his name off the roll is made within twelve months of the date of his enrolment; or
(b) fraud is proved to have been committed in connection with the failure or defect.
No solicitor shall be liable to have his name struck off the roll by reason only—
(a) that a solicitor who undertook a training responsibility for him under training regulations neglected or omitted to take out a practising certificate; or
(b) that the name of a solicitor who undertook such a responsibility for a period has been removed from or struck off the roll after the end of that period.