Leonard osbourne
Striker
Uplift the carpet and if you’re not confident of refitting try doing half the room at a time. Pull it back half way along with the underlay and lay a 8mm ply over the whole floor. Relay underlay and carpet then repeat on the other half.if you have gaps on bottom of your skirting apply decorators caulk around the perimeter. There will still be plenty of airflow underneath
Cheers