Consider each of the following assets and liabilities which appear in a company's  statement of financial position at 30 April 2018:

(a) A motor lorry which cost £100,000 is shown at its written down value of £20,000.  For tax purposes, its written down value is £30,000.

(b) A loan payable is shown at £60,000. The repayment of the loan will have no tax  consequences.

(c) An amount receivable is shown at £45,000. Of this amount, £25,000 has already  been taxed but the remaining £20,000 will be taxed in the accounting period in  which it is received. The whole £45,000 has already been included in accounting  profit.

(d) An amount payable is shown at £3,000. This relates to an expense which has  already been deducted when computing accounting profit but which will not be  deducted for tax purposes until it is paid.

Compute the tax base of each of these assets and liabilities and identify any taxable or deductible temporary differences.