And here's several pictures from this prop site - Doctor Who Props (about half way down the page). Apparently they're (one of the pairs) of trainers worn by Tennant:
Sorry for the necro post/bump but.. it's pretty bizarre that those are M9162s. M9162s are pretty yellow-ish/cream as opposed to "off white." His look like beat up normal bleached whites unless they bleached it themselves..?
Well no matter how hard I try I still can't find the original white trainers . Nor can I find the maroon ones :S Only pair I found were the bright red...which works for me LOL