There is no limit to the number of nomination forms that may be delivered for the same candidate.
If a candidate is validly nominated by more than one form:
the candidate should choose which one of the valid nomination forms (the 'selected' nomination form )
details on this selected form should be added to the statement of persons nominated and the ballot paper
If the candidate cannot or does not do this, then you should choose which one of the forms will be used.
If more than one nomination form is delivered and one of the nomination forms is invalid:
that paper is excluded from the forms that can be chosen by the candidate or yourself.
as long as at least one nomination form is valid, the candidate can be validly nominated
When an elector subscribes any delivered nomination form, even if it is not the selected nomination form, they are prevented from signing another nomination form1
and any later delivered nomination bearing their signature as a subscriber is invalid.2
Election of London-wide Assembly Members
There is no limit to the number of nomination forms that may be delivered for the same individual London-wide Assembly Member candidate or the same registered party but the last delivered form will supersede the earlier one(s).3