[Kojak]

According to your Great Presenter Count of 2020, Huw presented a grand total of four (weekday) Ten O'Clocks before 2003 - two of which were in Washington for the 2000 presidential election. It seems George Alagiah was actually the most frequent relief presenter when both Michael and Peter were away (which itself was a rare occurence).

As for Philip Hayton, apparently not. According to Genome, the closest he got to a network bulletin between 99 and 03 was an edition of Breakfast on the day after the US election, which he co-hosted from Washington:

Ah yes! I forgotten I did that as a result of lockdown boredom!!

Huw's 2 other appearances were indeed in 2002.

Now this is interesting - Genome suggests that Huw hosting the 10 in the video you posted was perhaps a late fill-in job, as it was actually Peter Sissons who was down to do the 10 that night:

BBC News

Wed 18th Dec 2002, 22:00 on BBC One London
With Peter Sissons. 10.25 Regional News
Then Weather with Helen Willetts.
Followed by National Lottery Update

Huw's two other (scheduled) appearances on the Ten that year were on the 19th June, and from New York on September 11th.