I think it was someone from JCVI on radio 4 - bascially they have trial data for 12+ but they're waiting and seeing what counties vaccining this age group pick up - like blood clots being picked up only during the mass vaccination and not the trials.
In meantime they want focus on getting through and double vaccinating the adult population as they are higher risk.
They did mention edcuation and vaccination being a positive if it kept access up it didn't come across as they'd decided no yet.
Also said there's no trial data for under 12 yet - only china has done as young as 3 but it's a vaccine we don't use so no likelyhood of primary school kids being vaccinated for at least another 12 + months.
So I'm with MarshaBradyo it will be very interesting to see what they decide to do with 12-18 year olds.