In 2016, Shaun bought 20% of the ordinary shares of an unlisted trading company. The shares cost £140,000. He owned the shares until January 2024 when he gave all the shares to a friend. On the date of the gift, the shares had a market value of

£500,000 and the company's assets were valued as follows:

Calculate the chargeable gain, assuming that both Shaun and his friend elect that the gain arising should (as far as possible) be held-over.