It's not good practice, but could be done as a last resort as long as it is clearly labled (so if someone turns off the upstairs ring to make some alterations they realise that your socket will remain live)
Working in a bungalo right now where original builder joined both rings so two breakers to everything. No evidence of alterations and judging by fact I found a joist sat on and squashing a cable, looks like he got it wrong in the first fix even before the joiners had been.
It's the way I do it, spreads the load across rings, keeps cable lengths equal.
Kitchen and bedrooms above on one ring, rest of house on another.
If wiring a big house it makes sense to only go to each area of the house with a ring covering up and down at the same time.
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