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During the party wall process, the council can say "We are worried about the additional loading to the structure and the potential for damage to neighbouring flats. In order to grant a license for alterations we need you to pay for a checking engineer to act on our behalf."
Doing so might add another £~10k to the cost. It can derail a basement or rooftop extension project even when you have already successfully gotten planning permission. I don't know whether it can be pre-emptively defended against. (This is what I mean by a practical concern.)
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