If you own your own business there may be tax exemptions applicable so as to reduce the tax to nil on the business assets. Coupled with the availability of the nil rate band these can reduce your potential tax liability considerably but to take advantage of this a will requires careful drafting. If your business operates as a private company, you may wish to provide for an option to purchase to be written into the will. Alternatively, you may wish your executors to sell your business during the administration of your estate.
The will needs to contain additional clauses to enable your executors to continue your business if you wish it to be sold as a going concern.
A properly drawn up partnership agreement will usually contain provision for what is to happen on the death of a partner. You cannot appoint a successor partner in your will.
Agricultural property also attracts a special exemption for inheritance tax but the rules are complicated. As with many other aspects of wills, the layman's idea of agricultural property does not necessarily coincide with that of the taxman.