"Bucks used to test VR only"
Then they apparently decided that doesn't work and they needed to test numerical reasoning etc., whilst (like Kent) muttering about too many children getting through who weren't quite what they expected, the 'rigour' was too much for them and they need tutor-proof exams.
A perfect example of this entire area being a vague, unsatisfactory kludge: Everything's fine.. Everything's fine.. Everything's fine.. Everything's fine.. [Political sea-change].. Change to keep pace with "new" theory [::ROFL::]... Everything's fine.. Everything's fine.. Everything's fine.. [Political sea-change].. Change to keep pace with "new" theory [::sighs::]...
IQ tests are similar and who talks about those honestly? We hear about precise three digit numbers, but they're the stuff of large scale statistics, different tests are not all equal and the scores are an a estimate with an associated probability of being correct with a corresponding, non-trivial margin of error. It's bound to be much worse for testing very young children.
Meanwhile at DD's state primary they put her on the G&T register for piano, some other kids for maths etc. She tends to be the best at maths but I think the school were trying to get a 'nice' spread on the register in case anyone wanted to look at it (Ofsted?), they have pushy parents to mollify and perhaps some of he brighter children who might take more encouragement from the label. I don't object.
No sign of 'propagating' but as someone (I forget) said 'the greater the gift, the greater the investment in the gift' and I expect there's a lot more investment in reading than maths at home. Given that Everyone+Dog whines about maths deficits these days, it isn't obviously a bad thing.