It is usual practice when writing about someone in such a context to refer to them initially by their full name and then by their surname only, and I agree that it should not be seen as disrespectful. I faced a similar dilemma when contributing much earlier in this thread. I never met him, and I saw him perform only once. For me to call him "Walter" would feel disrespectful, it would seem presumptuous and over-familiar. To write "Walter Pardon" every time would be long-winded, while "Mr Pardon" seems too formal.