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You should ensure that you take detailed advice on this. If you are non-resident in the UK you are normally taxable on your UK income.  This  means that UK tax should be deducted from UK pensions.

There are specific provisions in double tax treaties that can impact on this, and in particular there is a distinction made between government and non governmental pensions.

(Note that National Health Service Pensions are not regarded as Government pensions for the purposes  of most Double Taxation Agreements.)

You would need to review any applicable double tax treaty with your proposed country of residence as any relief available depends upon the terms of each DT treaty. If a benefit applies you can then make a claim with HMRC for the pension to be paid either
 - without tax deducted, or 
 - with  tax deducted at a reduced rate of tax as laid down in the DT treaty. 

We have some articles that look at this in detail check out:

http://www.offshoretax.co.uk/uk-emigration/offshore-tax/how-pensions-are-taxed-when-you-go-overseas.html

There are potentially a lot of tax issues to consider on any emigration from the UK.

In terms of capital gains tax there won't be an exit charge (unlike in some countries such as Australia) for  individuals. However you'll need to consider whether you have any held over gains as well as what you're planning to do with existing UK assets.

You also need to think about any UK tax reliefs and whether a disposal whilst UK resident may actually be advantageous if the overseas tax regime does not have similar reliefs.

Income tax also needs to be considered especially in terms of establishing whether a repayment is due.

Check out these articles for more detailed analysis 

Yes you can, but you'll need to consider your sources of income in detai. By establishing non UK residence you'll be outsdice the scope of UK tax on your overseas income. Any UK income or gains are less straightforward. UK gains can usually be avoided if you're non resident for at least five complete tax years. UK source income is technically within the scope of UK income tax but in practice there are a number of exemptions for investment income such as bank interest and dividends. 

See these articles for more detail on the UK tax exemption for non UK residents: 

http://www.offshoretax.co.uk/uk-emigration/offshore-tax/tax-implications-of-leaving-the-uk.html 

http://www.offshoretax.co.uk/uk-emigration/offshore-tax/checklist---emigration-to-avoid-capital-gains-tax.html 

http://www.offshoretax.co.uk/uk-emigration/offshore-tax/how-pensions-are-taxed-when-you-go-overseas.html

http://www.offshoretax.co.uk/uk-emigration/offshore-tax/when-a-non-uk-resident-is-taxed-on-uk-property.html 

There are certainly scenarios where offshore companies can be attractive in tax terms but they're not as widespread as many people think.

I If you're using an offshore companty the main advantage is that if it's non resident it will be exempt from tax on any gain on a future disposal. However, to counteract these massive tax banefits there are a number of anti avoidance rules that cover the management of the company and the location of the shareholders. If these apply they can eliminate the tax benefits of using the offshore company. Therefore if you are planning on using a company it's often a case of avoiding these anti avoidance rules. 

We've published a report that looks at the tax treatment of offshore companies for purchasing overseas property, and goes through exactly when you can and can't obtain UK tax benefits by using a company. This is on our main site and can be viewed here