Yes. It is important to include an acknowledgement of the help given or work carried out by another person or organisation in editing your thesis.The acknowledgement should take the following form:
'Professional editor, [editor's name], provided copyediting and proofreading services, according to the conditions laid out in the university-endorsed national guidelines, 'The editing of research theses by professional editors'.
For further information refer to HDR Thesis Rules and the Preparing for HDR thesis submission webpage (under Having your thesis edited).