Well, I do know my DS's (and therefore his friend's) school is on various contextual lists . It may be Reading has widened their context. So , DS was contextual for Aber, Swansea , Reading (he only applied to one of these mind) to pick three but not for other places which I ahve now forgotten (Bristol, I think). So, yes, I would imagine universities occasionally look again at what their contexts might be.
I think Reading may soemtimes go under the radar : really good uni but not 'famous' and not in a glamorous (or cheap!) location : so it may be they work harder on recruitment.