The benefit in kind bit is the problem with companies if you are a director or even a shadow director, as it is possible for the IR to impute a tax charge based on 20% of, broadly, the value of the a/c plus any other cost incurred by the company in providing you with the benefit of the a/c. This can be avoided by paying the company the going rate for the use of the aircraft. Any small amount of corporation tax on any resulting profit should be much less than the personal income tax on the benefit. As you presumably own the company alone or with others, the funds contributed will go to overhead cost or if they are excessivley large could be distributed.If they are excessive you are presumable charging yourself more than the going rate.
There is also a similar problem if you are not a director but a shareholder as the same type of liability occurs by way of a distribution to participators (broadly the shareholders. Different section of the Taxes Act but the same basic idea.
If the compnay is limited by Guarrantee the BIK on the directors is the same. I don't know of the top of my head about the distribution to participators if you are not a director - I'll look it up.
Perhaps one way of preserving limited liability might be to use a Limited Liability Partnership, which are a new thing in the UK. You could also I suppose use a trust but this get expensive and complicated.
I operate an A/c through a limited company, although the a/c is owned personally by the directors. The company is merely the operating vehicle and we pay it a market rate for operating the a/c. This also enabled us to recover lots of VAT but that's another thing.
If you want any more on this, shout.
F/o