I've found the TalkSport presenter (same name as the Winterstoke guy). He does seem to be quite a big figure there. That gives us:
4 down defined by 28
20 across defined by 2 down (loosely, I suspect!)
10 across defined by 28 across
and the rest uncontroversial.
That works, though as Drxx correctly pointed out much earlier (post 18), the 6-letter word is technically incomplete thematically.