21.5 In August 2009, Susannah (a sole trader) gave her business premises to her son. The premises had been bought by Susannah for £91,500 in July 2000 and extended in May 2001 at a cost of £34,500. Their market value in August 2009 was £215,000. Both Susannah and her son elected that the gain arising should be held-over.

Compute the amount of the held-over gain and explain how the situation would differ if Susannah's son had paid her £150,000 for the premises.