Find the last name of the first ever contact person of the organization with the highest UK Vat number.
return organizations ;return UK Vat numbers of #1 ;return #1 where #2 is  the   highest ;return contact people of #3 ;return the   first ever #4 ;return the   last name of #5
['select', 'project', 'comparative', 'project', 'project', 'project']