How does the isolation period work when subsequent members of a household test positive?

[Butterflyfluff]

Say person A tests positive and has to isolate for 10 days, along with other members of the household

Then person B develops symptoms on day 5 and tests positive on day 7

When does person B’s isolation end?

When does person A’s isolation end?

What if this continues with persons C and D and so on?

Bearing in mind people B, C and D can only have caught it from person A

There is a useful diagram on here which explains it.
www.google.com/amp/s/www.bbc.co.uk/news/amp/explainers-54239922

That’s excellent - thank you

Contact tracing phoned me today as now coming to end of isolation. They said as long as no one has left the house then person A doesn't need to restart isolation. I assume person B would need to isolate for a further 10 days from when symptoms started.