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Good news for those with futureproof AV systems this month, with the BBC confirming that any future 4K content will also use HDR and wide colour technologies (not to mention 5.1 or possibly greater surround sound). As the Beeb's Andy Quested asks (p9), what's the point in making Ultra HD programming in REC.709? Actually, though, I think there is a point. The new football season is kicking off about now, and will mark the third year that BT (via its pay-per-view package) has aired football games in 4K. Sky is unleashing its second season, combined with a Summer of Ultra HD cricket coverage. Neither broadcaster has yet embraced HDR, but it's not the sort of thing that necessarily occurs to you when gawping at crystal-clear sports. That's not to say…