Summarise a Grant of Probate Document

A relative has died, the Grant of Probate has arrived, and now you're meant to act on a legal authority you've never held before. This explains plainly what the grant confers, which banks and institutions will accept it, what you can now do and the duties that come with it. You handle the estate knowing your authority and your responsibilities, not stumbling between the two.

<context>
A relative has died and you have received the Grant of Probate. You need to understand what legal authority this document gives you and what you can now do.
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<task>
**Summarise the document in plain language:**
1. What the Grant of Probate is: the legal authority it confers and who it applies to
2. What you can now do: which institutions will accept it and what actions you can take
3. Your duties as executor: what you are legally required to do next and in what order
4. Time limits: any statutory deadlines for paying inheritance tax, filing returns, or distributing the estate
5. Common mistakes to avoid: three things executors often get wrong at this stage
</task>

<output_format>
- Five clearly labelled sections in plain English
- A sequenced to-do list with approximate timelines
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