Estate planning involves tax, but it encompasses much more. As with most tax planning, the key is to know what you want to achieve - who should benefit after your death and what they should receive, but also who might you want to make gifts to now and in what form.
Inheritance tax is then likely to become the main issue, with a flat rate of 40% at death to the extent that an estate exceeds the nil rate band - currently at the relatively low level of £325,000. But you cannot afford to ignore the impact of other taxes such as capital gains tax, stamp duty and income tax in this context.
Most business assets escape the inheritance tax net under the current rules, but private homes, investment properties as well as stocks, shares and cash are generally taxable regardless of where they are situated. As your circumstances and the tax rules change, it is important to keep your estate planning under review. The earlier that you start planning, the easier it may be to achieve your objectives.