** Shares of consulting firm Ricardo RCDO.L up 6.6% at 241 pence
** Company rejects shareholder Science Group's SAGS.L demand to replace its chair and two other directors
** RCDO says SAGS, which holds over 15% of its shares, demanded board changes and warned it would call a general meeting if company did not comply
** Science and technology consultancy firm SAGS down 0.7%
** RCDO shares fell 14.3% in 2024
(Reporting by DhanushVignesh Babu in Bengaluru)
((DhanushVignesh.Babu@thomsonreuters.com;))