UK options questions

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Hi

If anyone can help with a couple of questions, that would be great.

1) UK broker

I'd like to write covered calls on FTSE100 shares held in an ISA. Is there a UK broker than offers both and/or would allow me to use the shares as margin

2) Dividend adjustments

I'm not 100% sure how this works. The prices I can see quoted look like they don't factor in a large dividend that a share will pay in June.

Is the adjustment made when the share goes ex-div and the dividend is known?
How does it work?

Say the share price is 920 the day before the ex-div and the div is 25p

3) Margin

On IB I can't see what margins positions might incur. I wonder if the button is greyed out until I have funded my account. It isn't the easiest platform to use.

Any ideas on getting a better idea of margins and tools for evaluating basic option trades would be appreciated.

Many thanks for any help
 
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