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Howard
leggy_blonde
This summer the London Clay is going to have desiccated to levels not seen since 1976 and I expect that there will be a big increase in subsidence claims for pre 1980s homes this year. Less worrying is that there will be cracks that haven't been seen for years opening up that should close again to some extent as winter progresses.
I wouldn't advise filling any cracks now. Wait until April to see how much anything has closed up and hope that there isn't another severe drought next summer. Any new cracks over 3-4mm, get a Structural Engineer in to advise on repairs.