In June 2019, Walter bought 10,000 shares in Ovod plc at a cost of £7 per share. In September 2020, Rundico plc made a takeover bid for Ovod plc, offering the Ovod shareholders eight Rundico shares plus £4 in cash for every five Ovod shares. The offer was accepted on 2 September 2020 when the market value of shares in Rundico plc was £4.50 per share. Compute Walter's chargeable gain.