That's very close. Strictly speaking it was then the A34, but you have the right roundabout and you're looking in the right direction (North). The first of my dad's pictures shows the vehicle exiting the roundabout - roughly here:
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This event created a lot of excitement but I find no mention of it online.
@Dogtrousers' diagram* is illuminating as it shows where all the sections were manufactured. It partly answers the question of when did all the other bits pass by, something I'd been wondering ever since. I have some copies of
Newbury Weekly News from around that time. It's possible one of my dad's pictures was used, but if I can find that I will have been seriously lucky.
I see there's a thread on Concorde from about 11 years ago, so I think I might post the fully story there.
* and kudos for finding the link to Southampton.